Developing Data for Major Repairs of Turbine Engine Parts

AC 33-9 · FAA

Public domain · FAAAdvisory Circulars

Overview

The Developing Data for Major Repairs of Turbine Engine Parts (AC 33-9) is a public-domain FAA advisory circular, republished here as a free chaptered HTML edition with a linked table of contents and the official PDF.

Publisher: FAA
Document: AC 33-9
Pages: 176
Chapters: 7

Key points

This advisory circular provides guidance on developing technical data for major repairs of critical and complex turbine engine parts.
Repairs must restore the engine to at least its original or properly altered condition, ensuring airworthiness and compliance with applicable regulations.
The document categorizes parts into three categories based on their potential failure effects, with Category 1 being critical parts whose failure could prevent safe flight.
Developing major repair data should include a detailed description of the part, repair limitations, applicable regulatory requirements, and step-by-step instructions.
Templates for typical repairs of Category 2 parts are provided to assist in identifying technical elements and regulatory requirements.

Frequently asked questions

What is the purpose of this advisory circular?

The purpose is to provide information and guidance on developing technical data needed for major repairs of critical and complex turbine engine parts.

Are the guidelines in this advisory circular mandatory?

No, the guidance is neither mandatory nor regulatory in nature and describes acceptable means for demonstrating compliance with applicable regulations.

How are turbine engine parts categorized in this document?

Parts are categorized into three categories based on their potential failure effects, with Category 1 being critical parts that could prevent continued safe flight.

What should be included in major repair data packages?

Major repair data packages should include a description of the part, repair limitations, applicable regulatory requirements, and complete step-by-step instructions for the repair.

What is the role of the project aircraft certification office (PACO) in the repair process?

For major repairs of Category 1 parts, it is recommended to meet with the PACO to develop a substantiation plan before submitting a data package.

Figure A1.2. Part Interaction Considerations

4/30/10 AC 33 - 9 Appendix 1 Figure A1.2 . Part Interaction Considerations

Indirect Effect

Part Interaction

Stage 1 HPT Effective HPC press. Stall margin Stall at limiting Nozzle area/flow ratio consumption condition

Considerations

• Fluid interactions

• Air, fuel, oil

Indirect Effect

• Direct interactions

Fuel Pump Fuel flow Fuel to Starting Altitude re-light

• Mechanical

Impeller schedule Combustor characteristic capability

loading

• Aero loading

• Contact/wear

Time Relationship

• Chemical

Critical part Stage 2 HPT Cooling flow to Purge flow Hot gas temperature &

• Indirect interactions

Nozzle rotor level ingestion life

• Vibration

• Acoustical Direct Effect

Loads and Local dovetail Dovetail or slot

• Primary air

Rotor Blade moments on LLP life impact loading bottom life disk

• Secondary air

• Control

system

• Structural

dynamics

• Sensor

systems

4/30/10 AC 33 - 9 Appendix 2 APPENDIX 2. SAMPLE TEMPLATES 1. Purpose . This appendix includes templates for major repairs related to 17 engine part families , listed in Table A2 - 1 below . The FAA selected them based on typical repairs for complex turbine engine parts submitted as major. These templates will aid repair developers in identifying the technical elements and regulatory requirements they should con sider when developing and substantiating similar major repairs. Persons developing data must ensure that any additional technical criteria or regulatory requirements are met for their specific proposed major repair.

2. Template Instructions. Each temp late shows both shaded and un - shaded (clear) cells corresponding to the sample repair and its specific engineering, technical and regulatory considerations. Those cells that are generally applicable are un - shaded. However, the repair developer must decid e if the cells need to be completed or not. The templates identify the current part 33 regulations, Amendments 1 - 20 inclusive, applicable to turbine engines as an example . When reviewing the associated regulatory considerations, the repair developer shou ld determine applicability and identify the corresponding methods of compliance to be used to provide the supporting data.

a. The certification basis of the engine (s) on which the repaired part is eligible for installation identifies the regulatory requ irements that should be reviewed for applicability.

Applicable regulations are those regulations that must be evaluated to determine that the engine remains in compliance and airworthy with respect to the repair work performed . For critical and complex p arts, the repair developer should determine which of the original compliance findings to those applicable regulations could be affected by their proposed major repair . To do this, you must understand how the part to be repaired functions in the engine ope rating environment , and the associated regulatory requirements. Repair developers substantiate their repair to these requirements , using acceptable methods, to show that the condition of the engine on which the repaired part is installed will be at least equal to its original or properly altered condition .

b. Acceptable methods are identified as follows: (1) D - Documentation (for example, Instructions for Continued Airworthiness).

(2) A - Analysis of relevant data.

(3) I - Inspection (for exa mple, metallurgical examination, hardness testing , Non - destructive testing inspection ).

(4) R - Rig testing.

(5) C - Component testing .

(6) E - Engine testing .

4/30/10 AC 33 - 9 Appendix 2 (7) S - Similarity to previously FAA approved data. Repair developers will need to show that the previously approved data is applicable to the new proposed repair, and to the product type design if different than the type design for which the data was previously approved.

3. S ample T emplates. If a template is not available for a partic ular major repair , the repair developer can create or modify another as necessary.

Table A2 - 1. Sample Templates.

Template Number Title Page 1 Bearing Compartment and Carbon Seal 15 Parts Family 2 High Pressure Turbine (HPT) Blade 25 Part Family 3 Low Pressure Compressor (LPC) – 36 High Pressure Compressor (HPC) Blade Part Family 4 Blades – Low Pressure Turbine (LPT) 46 5 Combustor Part Family 55 6 Externals Part Family (Tubes, 66 Manifolds, Ducts, Brackets) 7 Fuel Nozzle Part Family 75 8 Gearbox H ousing Assembly Part 84 Family (Shafts, Gears, Housings) 9 Low Pressure Compressor (LPC) – 94 High Pressure Compressor (HPC) Stator Part Family – Vane Sector (And Full Ring) Type Stators 10 Low Pressure Compressor (LPC) – 103 High Presser Compressor (HPC) St ator Part Family – Fixed Vane Type Stators 11 Major Engine Cases 112 12 Major Rotating (Non - Life Limited) Part 12 1 Family (Excluding Turbine Shaft Coupling Part Family) 13 High Pressure Compressor 13 0 (HPC)/High Pressure Turbine (HPT)/Low Pressure Turb ine (LPT) Airseals (Non - Rotating) And Shrouds (Stationary) Part Family 14 Static Structure Part Fam ily (ducts, 138 bearing housings, etc.)

15 Low Pressure Compressor (LPC) – 148 High Pressure Compressor (HPC) Stator Part Fami ly – Variable Vane Type Stato rs 16 HPT Vane Part Family 15 7 4/30/10 AC 33 - 9 Appendix 2 17 Low Pressure Turbine (LPT) Vane Part 16 6 Family 4/30/10 AC 33 - 9 Appendix 2 Template 1 REPAIR SUBSTANTIATION CHECKLIST - BEARING COMPARTMENT AND CARBON SEAL PART FAMILIES Categories of Bearing Compartment & Carbon Seal Part Family Repair . Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance .

CATEGORIES OF REPAIR DESCRIPTION REPAIRS 1. Restoration of Protective Coating  This repair includes touch - up coating 2. Weld or Braze Repair  This repair excludes detail part replacement 3. Weld or Braze Repair  This repair includes detail part replacement 4. Assembly and/or Disassembly  This repair assembles, disassembles, removes and replaces detail parts, or s ub - assemblies without use of permanent attachment techniques (i.e.; welding or brazing). Assembly is either bolted or riveted .

5. Blend Repair 6. Dimensional Restoration by Coating or Plating 7. Bushing/Helicoil Repair 8. Straightening, Re - twist, or Reforming Repair  This repair includes straightening of bent knife edges 9. Surface Treatment Repair  This repair includes peening, vibratory tumble (e.g.; restoration of surface finish/texture) 10. Machining Repair  This repair includes lapping, skim cut, non - conventional machining .

11. Restoration of Adhesives , Bonding Agents , Potting Compound When the cell under a category of repair is not shaded, the items listed under that requirement should be reviewed for applicability, based on the repair design, and only the items pertinent to this category of repair should be selected and addressed appropriately. Items not selected need not be addressed.

An FAA - a pproved c onfiguration means a new part (produced under a PC, TSO, or PMA) or a previously approved r epaired part .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 10 11 No. Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine. This section provides the background for establishing the substantiation requirements.

a. Thermo - Mechanical Fatigue b. Oxidation c. Corrosion d. Elevated Temperature - Induced Changes (Creep, Diffusion, Ageing, Temperature Gradients) e. Wear du e to: Adhesion, Abrasion, Corrosion, Erosion, Cavitation, Fretting, Oxidation f. High Cycle Fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 10 11 No. Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design , and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fra cture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

3. Select all Material Properti es/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy, as a result of welds or braze, should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size , and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requ irements to be 1 2 3 4 5 6 7 8 9 10 11 No. Identified and Substantiated.

4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s physical and operational capability, as a result of the coating, should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Coating and Diffusion Zone Microstructure d. Coating Hardness e. Sintering f. Strip Requirements/Process g. Resi dual Stress h. Resistance to Spalling i. Thermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding (Interface Contamination) l. Hydrogen Embrittlement (Plating) m. Compatibility With Base Material/Other Coatings 5. Se lect surface treatment that applies ( without material removal ) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 10 11 No. Identified and Substantiated.

6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling , Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, re - twisting, re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning ( chemical , power flash, ultrasonic ) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K t ) m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs q. Contamination 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 10 11 No. Identified and Substan tiated.

7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 10 11 No. Identified and Substantiated.

11. Manufacturing requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specs  Quality Requirements  Critical Process Validation needs Applicable 14 CFR Part 33 Requirements Subpart A – General 12. 33.4 Instructions for Continuous Airworthiness (ICA's) 13. 33.5 Instruction manual for installing and operating the engine 14. 33.7 Engine ratings and operating limitations 15. 33.8 Selection of engine power a nd thrust ratings Subpart B – Design and Construction; General 16. 33.14 Start - stop cyclic stress (low cycle fatigue) 17. 33.15 Materials 18. 33.17 Fire prevention 19. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 10 11 No. Identified and Substantiated.

20. 33.21 Engine cooling 21. 33.23 Eng ine mounting attachments and structure 22. 33.25 Accessory attachments 23. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 24. 33.28 Electrical and electronic control systems 25. 33.29 Instrume nt connection Repair Process Capability Technical Substantiation Requirements Subpart E – Design and Construction ; Turbine Aircraft Engines 26. 33.62 Stress analysis 27. 33.63 Vibration 28. 33.6 5 Surge and stall characteristics (Note 2) 29. 33.66 Bleed air system 30. 33.67 Fuel system 31. 33.68 Induction system icing ( operability aspects) (Note 2) 32. 33.69 Ignition s system 33. 33.71 Lu brication system 34. 33.72 Hydraulic actuating system s 35. 33.73 Power or thrust response 36. 33.74 Continued rotation 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Airworthiness Standards to be 1 2 3 4 5 6 7 8 9 10 11 No. Substantiated Subpart E – Design and Construction ; Turbine Aircraft Engines (continued) 37. 33.75 Safety analysis 38. 33.76 Bird ingestion ( operability aspects of ingestion) 39. 33.77 Foreign object ingestion — ice ( opera bility aspects of ingestion) 40. 33.78 Rain and hail ingestion 41. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 42. 33.83 Vibration test 43. 33.85 Calibra tion tests 44. 33.87 Endurance test 45. 33.88 Engine overtemperature test 46. 33.89 Operation test (Note 2) 47. 33.90 Initial maintenance inspection 48. 33.91 Engine component tests (HCF/LCF ben ch testing) 49. 33.92 Rotor locking tests 50. 33.93 Teardown inspection 51. 33.94 Blade containment and rotor unbalance tests ( weight changes) 52. 33.95 Engine - propeller system tests 53. 33.96 Eng ine tests in auxiliary power unit (APU) mode 54. 33.97 Thrust reversers 55. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certifica tion Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 2 REPAIR SUBSTANTIATION CHECKLIST – HIGH PRESSURE TURBINE (HPT) BLADE PART FAMILY Categories of HPT Blade Part Family Repair . Det ermine which repair description best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance .

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Overcoat Repair (without stripping) 2. Strip and Re - coat Repair  This repair removes and replaces all types of coatings.

3. Weld or Braze Repair (excludes detail parts replacement)  Includes restoration of airfoil tip and chord length 4. Weld or Braze Repair  Includes detail parts replacement 5. Surface Treatment Repa ir Including shot - peen, glass bead peen, and vibratory tumble (e.g.; restoration of surface finish/texture).

6. Blend Repair 7. Blade Internal Cavity Cleaning Repair 8. Sulfidation or Corrosion Repair 9. Assembly and/or Disassembly . This repair rem oves and replaces details parts without the use of permanent attachment techniques (i.e. , welding or brazing) , but assembly is either bolted or riveted.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated. R epair Properties and Requirements to be Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine.

This section provides the backgr ound for establishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients) e. Wear due to: adhesion, abrasion, corrosion, erosion, cav itation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O 3 chemical attack, etc.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design , and assess their impact o n the part’s airworthiness: 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated. Repair Properties and Requirements to be Identified and Substantiated.

Mechanical Properties: a. Stre ss - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructur e (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance (consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight ) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated. Repair Properties and Requirements to be Id entified and Substantiated.

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone ( welding) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated. Repair Properties and Requirements to be Identified and Substantiated.

4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s physical and operational capability as a result of the coating should be evaluated for airworthiness.

5. Select Surface Treatment that applies (Without Material Removal) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durabil ity due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

n. Plating o. Dimensional Short - falls p. Repetitive or Con flicting Repairs q. Contamination 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated. Repair Properties and Requirements to be Identified and Substantiated.

7. Establish the Applicabi lity of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design, and evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to 1 2 3 4 5 6 7 8 9 No. be Identified and Substantiated.

Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consid eration to mating part(s): a. Surface finish/texture b. Shotpeen Intensity/Coverage c. Bearing bore dimensions and location characteristics d. Pressure Strength Test e. Flow Capacity test f. Dimensions, including heat distortion effects  Roundness  Flatness  Parallelism  Conce ntricity  True Position Tolerances  Edge Distance  Requirements  Finish Dimensions Requirements g. Airfoil Profile  Leading & Trailing Edge Contour  Concave & convex contours  Thickness  Chord & Airfoil Length  Twist/Lean/Bow h. Tip Length i. Airfoil wall thickness 10. Part Weight: a. Mass b. Moment 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to 1 2 3 4 5 6 7 8 9 No. be Identified and Substantiated.

11. Platform width & (angel wing) Cross Notch/Cross Shrou d geometry 12. Cooling (Total flow, flow split, back flow margin, hole exit geometry/angle/location, cross - over hole size, metering plate) Repair Process Capability Technical Substantiation Requirements 13. Verification Pl an with Significant Operations Identified for Repair Source Qualification 14. Process Demonstration (including variability requirements) 15. Part Demonstration/Inspection 16. Manufacturing requirements for fabrication of r epair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 17. 33.4 Instructions for Continuous Airworthiness (ICA's) Repair Process Capability Technical Substantiation Requirements 18. 33.5 Instruction manual for installing and operating the engine 19. 33.7 Engine ratings and operati ng limitations 20. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 21. 33.14 Start - stop cyclic stress (low cycle fatigue) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Pr operties and Requirements to 1 2 3 4 5 6 7 8 9 No. be Identified and Substantiated.

22. 33.15 Materials 23. 33.17 Fire prevention 24. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.9 0 ) 25. 33.21 Engine cooling 26. 33.23 Engine mounting attachments and structure 27. 33.25 Accessory attachments 28. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 29. 33.28 Electrical and el ectronic control systems 30. 33.29 Instrument connection Subpart E – Design and Construction; Turbine Aircraft Engines 31. 33.62 Stress analysis 32. 33.63 Vibration 33. 33.65 Surge and stall character istics (Note 2) 34. 33.66 Bleed air system 35. 33.67 Fuel system 36. 33.68 Induction system icing ( operability aspects) (Note 2) 37. 33.69 Ignition s system 38. 33.71 Lubrication system 39. 33.72 Hydraulic actuating system s 40. 33.73 Power or thrust response 41. 33.74 Continued rotation 42. 33.75 Safety analysis 43. 33.76 Bird ingestion ( operability aspects of ingestion) 44. 33.77 Foreig n object ingestion — ice ( operability aspects of ingestion) 45. 33.78 Rain and hail ingestion 46. 33.79 Fuel burning thrust augment o r 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to 1 2 3 4 5 6 7 8 9 No. be Identified and Su bstantiated.

Subpart F – Block Tests; Turbine Aircraft Engines 47. 33.83 Vibration test 48. 33.85 Calibration tests 49. 33.87 Endurance test 50. 33.88 Engine overtemperature test 51. 33.89 Operation test (Note 2) 52. 33.90 Initial maintenance inspection 53. 33.91 Engine component tests (HCF/LCF bench testing) 54. 33.92 Rotor locking tests 55. 33.93 Teardown inspection 56. 33.9 4 Blade containment and rotor unbalance tests ( weight changes) 57. 33.95 Engine - propeller system tests 58. 33.96 Engine tests in auxiliary power unit (APU) mode 59. 33.97 Thrust reversers 60. 33.99 General conduc t of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions

Next: Categories of LPC/HPC Blade Part Family Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. →

Categories of LPC/HPC Blade Part Family Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

4/30/10 AC 33 - 9 Appendix 2 Template 3 REPAIR SUBSTANTIATION CHECKLIST – LOW PRESSURE COMPRESSOR (LPC) – HIGH PRESSURE COMPRESSOR (HPC) BLADE PART FAMILY Categories of LPC/HPC Blade Part Family Repair. Determine which repair description best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Strip and Re - coat Repair  This repair removes and replaces any and all types of coatings 2. Weld or Braze Repair (excludes detail parts replacement)  This repair includes restoration of airfoil tip and chord length 3. Weld or Braze Repair  This repair includes detail parts replacement 4. Assembly or Disassembly  This repair removes and replaces detail parts without the use of permanent attachment techniques (i.e. , welding or brazing) but assembly is either bolted or riveted.

5. Blend Repair 6. Remove and Restore Anti - gallant Coating 7. Dimensional Restoration by Coating or Plating 8. Straightening, Re - twist or Re - forming Repair  This repair includes dent repair 9. Surface Treatment Repair  This repair includes shot - peen, glass bead peen, vibratory tumble (e.g. , restoration of surface finish/texture) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated.

a. Thermo - Mechanical Fatigue b. Oxidation c. Corrosion d. Elevated Temperature - Induced Changes (Creep, Diffusion, Ageing, Temperature Gradients) e. Wear due to: Adhesion, Abrasion, Corrosion, Erosion, Cavitation, Fretting, Oxidation f. High Cycle Fatigue g. Rubbing, foreign object im pact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design , and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistan ce n. Wear Resistance (Consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Re q Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated. Repair Properties and Requirements to be Identified and Substantiated.

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitat es, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. Identified and Substantiated. Repair Properties and Requi rements to be Identified and Substantiated.

4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s physical and operational capab ility as a result of the coating should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Coating and Diffusion Zone Microstructure d. Coating Hardness e. Sintering f. Strip Requirements/Process g. Residual Stre ss h. Resistance to Spalling i. Thermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding ( interface contamination) l. Hydrogen Embrittlement ( plating ) m. Compatibility with Base Material/Other Coatings 5. Select Surf ace Treatment that applies ( without material removal ) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, re - twisting, re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning (Chemical, power flash, Ultrasonic) k. Residual Plating, Stripping, or Cleaning Agents l. S tress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs q. Contamination 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluat e any changes to an existing repair sequence for potential impact on the airworthiness of the part.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 8. Select all that may be potentially affected by the repair design and evaluate system effect(s): Stress a. Heat Transfer b. Secondary Airflow c. Aerodynamics Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen Intensity/Coverage c. Bearing bore dimensions and location characteristics d. Pressure Strength test e. Flow Capacity test f. Dimensions, including heat distortion effects  Roundness  Flatness  Parallelism  Concentricity  True Position Tolerances  Edge Distance Requirements  Finish Dimensions Requirements g. Airfoil Profile  Leading & Trailing Edge Contour  Concave & convex contours  Thickness  Chord & Airfoil Length  Twist/Lean/Bow h. Tip Length i. Airfoil wall thickness 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 Critical Meas urable Characteristics 10. Dovetail functional fit test 11. Part weight test: a. Mass Weight b. Moment Weight Repair Process Capability Technical Substantiation Requirements 12. Technical Plan wit h Significant Operations Identified 13. Process Demonstration (including variability requirements) 14. Part Demonstration/Inspection 15. Manufacturing requirements for fabrication of repair details or replacement sections u sed to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuous Airwor thiness (ICA's) 17. 33.5 Instruction manual for installing and operating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.8 8; and 33.90 ) 24. 33.21 Engine cooling 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirements to be No. Identified and Sub stantiated. 1 2 3 4 5 6 7 8 9 27. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 28. 33.28 Electrical and electronic control systems 29. 33.29 Instrument connection Subpart E – Design and Const ruction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characteristics (Note 2) 33. 33.66 Bleed air system 34. 33.67 Fuel system 35. 33.68 Induction system icing (operability aspects) ( Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continu ed rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operability aspects of ingestion) 43. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47. 33.85 Calibration tests 48. 33.87 Endurance test 49. 33.88 Engine overtempe rature test 50. 33.89 Operation test (Note 2) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspect ion 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 55. 33.94 Blade containment and rotor unbalance tests (Weight changes) 56. 33.95 Engine - propeller s ystem tests 57. 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 4 REPAIR SUBSTANTIATION CHECKLIST - LOW PRESSURE TURBINE (LPT) BLADE PART FAMILIES Categories of LPT Blade Part Family Repair. Determine which repair description best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance .

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Strip and Re - coat Repair  This repair removes and replaces any and all types of coatings 2. Overcoat Repair (without stripping) 3. Weld or Braze Repair (excludes detail part replacement)  Includes restoration of airfoil tip and chord length 4. Weld or Braze Repair  Includes detail part repl acement 5. Sulfidation or Corrosion Repair 6. Blend Repair 7. Straightening, Re - twist, or Reforming Repair 8. Surface Treatment Repair  This repair includes shot peen, glass bead peen, vibratory tumble (e.g . , restoration of surface finish/texture) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

a. Thermo - Mechanical Fatigue b. Oxidation c. Corrosion d. Elevated Temperature - Induced Changes (Creep, Diffusion, Ageing, Temperature Gradients) e. Wear due to: Adhesion, Abrasion, Corrosion, Erosion, Cavitation, Fretting, Oxidation f. High Cycle Fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by th e repair design , and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s M odulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply an d evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipit ates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Coating Material Properties, Characteristics & Processes: a. Deposited Material Composition b. Thickness, Covera ge & Uniformity c. Microstructure d. Hardness e. Sintering f. Strip Process g. Residual Stress h. Lubricant Properties i. Spalling Resistance j. Thermal Resistance k. Erosion Resistance l. Bonding (Interface Contamination) m. Environmental Resistance n. Diffusion Zone o. Hydrogen Embrittlement Free p. (Plating) q. Compatibility With Base Material 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

5. S elect Surface Treatment that applies ( without material removal ) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durabilit y due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning (Chemical, power flash, Ultrasonic) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Confl icting Repairs q. Contamination 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 8. Select all that may be potentially affected by the repair design, and evaluate system effect(s): a. Structural Strength, including m ajor load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part feat ures and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen Intensity /Coverage c. Bearing bore dimensions and location characteristics d. Pressure Strength test e. Flow Capacity test f. Dimensions, including he at distortion effects  Roundness  Flatness  Parallelism  Concentricity  True Position Tolerances  Edge Distance Requirements  Finish Dimensions Requirements g. Airfoils Profile  Leading & Trailing Edge Contour  Concave & convex contours  Thickness  Chord & Airfoil Lengt h  Twist/Lean/Bow h. Tip Length i. Airfoil wall thickness j. Throat Area 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 Critical Measurable Characteristics 10. Part Weight: a. Moment b. Mass 11. Platform width & (angel wing) Cross Notch/Cross Shroud geometry MPE Repair Process Capability Technical Substantiation Requirements 12. Verification Plan with Significant Operations I dentified for Repair Source Qualification 13. Process Demonstration (including variability requirements) 14. Part Demonstration/Inspection 15. Manufacturing requirements for fabrication of repair details or replacement section s used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuou s Airworthiness (ICA's) 17. 33.5 Instruction manual for installing and operating the engine 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 Subpart A – General 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90) 24. 33.21 Engine cooling 25. 33.23 Engine mounting attachments and st ructure 26. 33.25 Accessory attachments 27. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 28. 33.28 Electrical and electronic control systems 29. 33.29 Instrument connection Subpart E – Design and Construction; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characteristics (Note 2) 33. 33.66 Bleed air system 34. 33.67 Fuel system 35. 33.68 Ind uction system icing (operability aspects) (Note 2) 36. 33.69 Ignitions system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating systems 39. 33.73 Power or thrust response 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 Subpart E – Design and Construction; Turbine Aircraft Engines (continued) 40. 33.74 Continued rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion (operability aspects of ingestion) 43. 33.77 Foreign object ingestion — ice (operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thrust augmentor Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47 33.85 Calibration tests 48. 33.87 Endurance test 49. 33.88 Engine overtemperature test 50. 33.89 Operation test (Note 2) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 55. 33.94 Blade containment and rotor unbalance tests (weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Conti nued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 5 REPAIR SUBSTANTIATION CHECKLIST - COMBUSTOR PART FAMILY Categories of Com bustor Part Family Repairs. Determine which repair description best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Strip & Recoat Repair  This repair removes and replaces any and all types of coatings.

2. Blend Repair 3. Straightening, Re - twist, or Reforming Repair  This repair includes straightening of bent flanges 4. Weld/Braze Repair  Excludes Detail Part Replacement 5. Weld/Braze Repair  Includ es Detail Part Replacement 6. Assembly and/or Disassembly  This repair removes and replaces detail parts without use of permanent attachment technique, (i.e. weld or braze); assembly is either bolted or riveted.

7. Bushing/Helicoil Repair 8. Dimension al Restoration by Coating or Plating.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 Repair Properties and Requirements to be Identified and Substantiated.

1. Applicable Degradati on Modes : Select all that apply based on the function of the part and its operating environment in the engine. This section provides the background for establishing the substantiation requirements.

a. Thermo - Mechanical Fatigue b. Oxidation c. Corrosion d. Elevated Temperature - Induced Changes (Creep, Diffusion, Ageing, Temperature Gradients) e. Wear due to: Adhesion, Abrasion, Corrosion, Erosion, Cavitation, Fretting, Oxidation f. High Cycle Fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

2. Select all mechanical, metallurgical, and physic al properties of the part affected by the repair design and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, S trength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

3. Select all Material Properties/Characteristics for w eldments or brazed joints that apply and evaluate them and their interface with the parent metal.

The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain siz e, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) Material Properties/Degradation Modes/Product Qualities/etc.

Technical Substantiat ion Requirements 4. Coating & Plating Material Properties Characteristics & Processes: a. Deposit material composition b. Thickness, Coverage, and Uniformity c. Microstructure d. Hardness e. Sintering f. Strip process g. Residual stress h. Lubricant properti es i. Spalling Resistance j. Thermal Resistance k. Erosion Resistance l. Bonding ( Interface m. Contamination ) n. Environmental Resistance o. Diffusion Zone p. Hydrogen Embrittlement Free Plating q. Compatibility with base material 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair De sign Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 Repair Properties and Requirements to be Identified and Substantiated.

5. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail (s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen intensity / coverage c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, including heat distor tion effects  Roundness  Flatness  Parallelism  Concentricity  True position tolerances  Edge distance requirements  Finish dimensions requirements 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 Repair P roperties and Requirements to be Identified and Substantiated.

6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning (Chemical, power flash, Ultrasonic) k. Residual Plating, Stri pping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs q. Contamination 7. Establish the Applicability of the Repair and the Repair Proc essing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements No. to be Identified and Substantiated. 1 2 3 4 5 6 7 8 8. Select all that may be potentially affected by the repair design, and evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/tex ture b. Shotpeen Intensity/Coverage c. Bearing bore dimensions and location characteristics d. Pressure Strength test e. Flow Capacity test f. Dimensions, including heat distortion effects g. Roundness h. Flatness i. Parallelism j. Concentricity k. True Position Tolerances l. Edge Distanc e Requirements m. Finish Dimensions Requirements n. Diameter/Locating o. Air Swirler Features p. Mixing Air (dilution) Features q. Datum Location Features r. Air Cooling Hole Diameter s. Flowpath Exit Features t. Sealing Features u. Aft Seal v. Fuel Nozzles w. Igniter interfaces x. Flanges 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

10. Cooling Feature Characteristics: a. Air flow b. Hole Diameter c. Blocked Hole Quantity/Location d. Cooling Slot Height/Length/Location e. Quantity of Holes/Slots 11. Thermal Barrier Coating: a. Thickness b. Coverage c. Type Repair Process Capability Technical Substantiation Requireme nts 12. Verification Plan with Significant Operations Identified for Repair Source Qualification 6 3 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and No. Requirements to be Identified and 1 2 3 4 5 6 7 8 Substantiated.

Repair P rocess Capability Technical Substantiation Requirements 13. Process Demonstration Including: a. Variability Requirements 14. Part Demonstration/Inspection 15. Manufacturing Requirements for fabrication of repair details or repla cement sections to accomplish repair: a. Drawings/Specifications b. Quality Requirements c. Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuou s Airworthiness (ICA's) 17. 33.5 Instruction Manual for Installing and Operating the Engine 18. 33.7 Engine Ratings and Operating Limitations 19. 33.8 Selection of Engine Power and Thrust Ratings Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.8 8; and 33.90 ) 24. 33.21 Engine 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and No. Requirements to be Identified and 1 2 3 4 5 6 7 8 Substantiate d.

27. 33.27 Turbine, compressor, fan, and turbo supercharger rotors 28. 33.28 Electrical and electronic control systems 29. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characteristics, (Note 2) 33. 33.66 Bleed air system 34. 33.67 Fuel system 35. 33.68 Induction system icin g, ( operability aspects ) (Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operability aspects of ingestion ) 43. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion ) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thr ust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47. 33.85 Calibration tests 48. 33.87 Endurance tests 49. 33.88 Engine overtemperature test 50. 33.89 Ope ration test (Note 2) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF Bench Testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Re q Repair Properties and No. Requirements to be Identified and 1 2 3 4 5 6 7 8 Substantiated.

55. 33.94 Blade containment and rotor unbalance tests ( weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine test s in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmo spheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 6 REPAIR SUBSTANTIATION CHECKLIST - EXTERNALS PART FAMILY (Tubes, Manifolds, Ducts, Brackets) Categories of Externals (Tubes, Manifolds, Ducts, Brackets) Part Family. Determine which repair description best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

2. Weld or Braze Repair  This repair excludes detail part replacement 3. Weld or Braze Repair  Includes detail part replacement 4. Blend Repair 5. Sulfidation or Corrosion Repair 6. Dimensional Restoration by Coating or Plating 7. Bushing/Helicoil Repair 8. Straightening , Re - twist or Reforming Repair  This repair includes dent repair 9. Repairs to Restore Adhesives , Bonding Agents , Potting Compounds .

10. Machining Repair  This repair includes lapping, skim cut, non - conventional machining 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 10 Properties and Requirements to be Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine. T his section provides the background for establishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 10 Properties and Requirements to be Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design and assess their impact on the part’s airwor thiness: Mechanical Properties : a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chem ical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance (Consider wear types in (1)(e)) o. Crack Prop agation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Subst antiated. Repair 1 2 3 4 5 6 7 8 9 10 Properties and Requirements to be Identified and Substantiated.

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the pa rent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, e tc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Coating & Plating Material Properties Characteristics & Processes: a. Deposited Material Composition q.

b. Thickness, Coverage & Uniformity c. Microstructure d. H ardness e. Sintering f. Strip Process g. Residual Stress h. Lubricant Properties i. Spalling Resistance j. Thermal Resistance k. Erosion Resistance l. Bonding (Interface Contamination) m. E nvironmental Resistance n. Diffusion Zone o. Hydrogen Embrittlement Free (Plating) p. Compatibility Wit h Base Material 5. Select Surface Treatment that applies ( without material removal ) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 10 Properties and Requirements to be Identified and Substantiated.

6. Evaluate any degradation in the part’s function or durability due to the fol lowing processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, re - twisting, re - forming e. Blending f. Honing g. Lappin g h. Grit Blast i. Stripping j. Cleaning (Chemical, power flash, Ultrasonic) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K t ) m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs q. Contamination 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evalu ate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design and evaluate system effect(s): a. Structural Strength, includin g major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired pa rt features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen intensity / coverage c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, inclu ding heat distortion effects  Roundness  Flatness  Parallelism  Concentricity  True position tolerances  Edge distance requirements  Finish dimensions requirements 10. Coating Coverage Definition 11. Blend Area Proximity Limits Defined 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 Repair Process Capability Technical Substantiation Requirements 12. Verification Plan with S ignificant Operations Identified for Repair Source Qualification 13. Process Demonstration (including variability requirements) 14. Part Demonstration/Inspection 15. Manufacturing requirements for fabrication of repair d etails or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33. 4 Instructions for Continuous Airworthiness (ICA's) 17. 33.5 Instruction manual for installing and operating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust rati ngs Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is asso ciated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 24. 33.21 Engine cooling 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments 27. 33.27 Turbine, compressor, fan, and t urbo - supercharger rotors 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 Subpart B – Design and Construction; General 28. 33.28 Electrical and electronic control systems 29. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stal l characteristics 33. 33.66 Bleed air system 34. 33.67 Fuel system 35. 33.68 Induction system icing ( operability aspects) (Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operability aspects of ingestion) 43. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vi bration test 47. 33.85 Calibration tests 48. 33.87 Endurance test 49. 33.88 Engine overtemperature test 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiate d. 1 2 3 4 5 6 7 8 9 10 Subpart F – Block Tests; Turbine Aircraft Engines 50. 33.89 Operation test 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 55. 33.94 Blade containment and rotor unbalance tests ( weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine tests in auxilia ry power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmosp heric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 7 REPAIR SUBSTANTIATION CHECKLIST - FUEL NOZZLE PART FAMILY Categories of Fuel Nozzle Part Family Repair. Determine which repair description best fit s the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance.

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Blend Repair 2. Thread Restoration and Functional Testing.

3. Assembly and/or Disassembly  Repair r emoves and replaces detail parts without use of permanent attachment techniques, (i.e. welding or brazing) but assembly is either bolted or riveted.

4. Machining Repair  Includes lapping, skim cut, non - conventional machining.

5. Weld or Braze Repair  Exc ludes Detail Part Replacement 6. Weld or Braze Repair  Includes Detail Part Replacement 7. Dimensional Restoration By Coating or Plating 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 Propertie s and Requirements to be Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine.

This section provides the background for es tablishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. Wear due to : adhesion, abrasion, corrosion, erosion, cavitation, fre tting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 Properties and Requirements to be Identifie d and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Frac ture Toughness c. Fatigue Strength (S - N, Goodman, dwell time ) d. Creep e. Tensile Properties ( yield, strength, elongation ) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties : i. Chemical Composition ( alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance ( consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be Identified No. and Substantiated. Repair Properties and 1 2 3 4 5 6 7 Requirements to be Identified and Substant iated.

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s physical and operational capability as a result of the coating should be evaluated for airwor thiness.

5. Select Surface Treatment that applies ( without material removal ) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs q. Contamination 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes t o an existing repair sequence for potential impact on the airworthiness of the part.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be Identified No. and Substantiated. Repair Properties and 1 2 3 4 5 6 7 Requirements to be Identified and Substantia ted.

8. Select all that may be potentially affected by the repair design and evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. S urface finish/texture b. Shotpeen intensity / coverage c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, including heat distortion effects  Roundness  Flatness  Parallelism  Concentricity  True position tolera nces  Edge distance requirements  Finish dimensions requirements g. Diameter/ locating h. Air swirler features i. Mixing air (dilution) features j. Datum location features k. Air cooling hole diameter l. Flowpath exit features m. Aft seal n. Flanges o. Igniter interfaces 4/30/10 AC 33 - 9 Appendix 2 CA TEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated, Cont’d. 1 2 3 4 5 6 7 Critical Measurable Characteristics 10. Material Debit Due To: a. Heat Treat b. Weld, Braze, Coat or Plate Processes c. Mac hine Process d. Blend e. Hone f. Lap g. Grit Blast h. Strip 11. Flow Volume 12. Flow Pattern 13. Pressure/Leak Test Repair Process Capability Technical Substantiation Requirements 14. Verification Plan with Signi ficant Operations Identified for Repair Source Qualification 15. Process Demonstration (including variability requirements) 16. Part Demonstration/Inspection 17. Manufacturing requirements for fabrication of repair details or re placement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 18. 33.4 Instructions for Cont inuous Airworthiness (ICA's) 19. 33.5 Instruction manual for installing and operating the engine 20. 33.7 Engine ratings and operating limitations 21. 33.8 Selection of engine power and thrust ratings 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REP AIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 Subpart B – Design and Construction; General 22. 33.14 Start - stop cyclic stress (Low cycle fatigue) 23. 33.15 Materials 24. 33.17 Fire prevention 25. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 26. 33.21 Engine cooling 27. 33.23 Engine mounting attachments and structure 28. 33.25 Acc essory attachments 29. 33.27 Turbine, compressor , fan , and turbo supercharger rotors 30. 33.28 Electrical and electronic control systems 31. 33.29 Instrument connection Subpart E – Design and Construction; Turbine Airc raft Engines 32. 33.62 Stress analysis 33. 33.63 Vibration 34. 33.65 Surge and stall characteristics (Note 2) 35. 33.66 Bleed air system 36. 33.67 Fuel system 37. 33.68 Induction system icing ( operabili ty aspects) (Note 2) 38. 33.69 Ignition s system 39. 33.71 Lubrication system 40. 33.72 Hydraulic actuating system s 41. 33.73 Power or thrust response 42. 33.74 Continued rotation 43. 33.75 Safety analys is 44. 33.76 Bird ingestion ( operability aspects of ingestion) 45. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 46. 33.78 Rain and hail ingestion 47. 33.79 Fuel burning thrust augment o r 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 Material Properties/Degradation Modes/Product Qualities/etc. Technical Substantiation Requirements Subpart F – Block T ests; Turbine Aircraft Engines 48. 33.83 Vibration test 49. 33.85 Calibration tests 50. 33.87 Endurance test 51. 33.88 Engine overtemperature test 52. 33.89 Operation test (Note 2) 53. 33.90 Initial mai ntenance inspection 54. 33.91 Engine component tests (HCF/LCF bench testing) 55. 33.92 Rotor locking tests 56. 33.93 Teardown inspection 57. 33.94 Blade containment and rotor unbalance tests ( weight changes) 58 . 33.95 Engine - propeller system tests 59. 33.96 Engine tests in auxiliary power unit (APU) mode 60. 33.97 Thrust reversers 61. 33.99 General conduct of block tests Part 33 Appendix A – Instructions for Continued Airwort hiness Part 33 Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions

Next: Categories of Gearbox Housing Assembly Part Family (shafts, gears, housings). Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. →

Categories of Gearbox Housing Assembly Part Family (shafts, gears, housings). Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

4/30/10 AC 33 - 9 Appendix 2 Template 8 REPAIR SUBSTANTIATION CHECKLIST - GEARBOX HOUSING ASSEMBLY PART FAMILY (SHAFTS, GEARS, HO USINGS) Categories of Gearbox Housing Assembly Part Family (shafts, gears, housings). Determine which repair description best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance .

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Restoration of Protective Coating  Includes Touch Up Coating 2. Weld or Braze Repair  This repair excludes detail part replacement 3. Weld or Braze Repair  Includes detail part replacement 4. Assembly and/or Disassembly  This repair assembles, disassembles, removes and replaces detail parts, or sub - assemblies without use of permanent attachment techniques (i.e.; welding or brazing). Assembly is either bolted or riveted .

5. Sulfidation or Corrosion Repair 6. Blend Repair 7. Dimensio nal Restoration by Coating or Plating 8. Bushing/Helicoil Repair 9. Straightening, Re - twist, or Reforming Repair  This repair includes straightening of bent knife edges 10. Surface Treatment Repair  This repair includes peening, vibratory tumble (e.g.; re storation of surface finish/texture) 11. Machining Repair  This repair includes lapping, skim cut, non - conventional machining 12. Restoration of Adhesives, Bonding Agents, Potting Compounds.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requireme nts to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 10 11 12 Properties and Requirements to be Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its opera ting environment in the engine. This section provides the background for establishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperatur e gradients ) e. Wear due to : adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirement s to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 10 11 12 Properties and Requirements to be Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair desig n and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natu ral Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resis tance (Consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Rep air Design Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 11 12 3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. T he effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosit y (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Coating & Plating Material Properties Characteristics & Processes: a. Deposited Material Composition b. Thickness, Coverage & Uniformity c. Microstructure d. Hardness e. Sintering f. Strip Process g. Residual Stress h. Lubricant Properties i. Spalling Resistance j. Thermal Resistance k. Erosion Resistance l. Bonding (Interface Contamination) m. Environmental Resistance n. Diffusion Zone o. Hydrogen Embrittlement Free (Plating) p. Compatibility With Base Material 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 11 12 5. Select Surface Treatment that applies (without material removal) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its im pact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning (Chemical, power flash, Ultrasoni c) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs q. Contamination 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 11 12 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence f or potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design and evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodyna mics e. Weight f. Center of Gravity g. Moment of Weight 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 11 12 Critical Measurable Characteristics 9. Bearing Bore: a. Dimension b. Location 10. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part( s): a. Surface finish/texture b. Shotpeen intensity/coverage c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, including heat g. distortion effects  Roundness  Flatness  Parallelism  Concentricity  True position tolerances  Edge distance requirements  Finish dimensions requirements 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 11 12 Critical Measurable Ch aracteristics continued 11 Oil Nozzle Flow Test Repair Process Capability Technical Substantiation Requirements 12. Verification Plan with Significant Operations Identified for Repair Source Qualification 13. Process Demonstration (including variability requirements) 14. Part Demonstration/Inspection 15. Manufacturing requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuous Airworthiness (I CA's) 17. 33.5 Instruction manual for installing and operating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust ratings 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REP AIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 11 12 Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 2 1. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 24. 33.21 Engine cooling 25. 33.23 Engine mounting a ttachments and structure 26. 33.25 Accessory attachments 27. 33.27 Turbine, compressor, fan, and turbo supercharger rotors 28. 33.28 Electrical and electronic control systems 29. 33.29 Instrument con nection Subpart E – Design and Construction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characteristics (Note 2) 33. 33.66 Bleed a ir system 34. 33.67 Fuel system 35. 33.68 Induction system icing ( operability aspects) (Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating syst em s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operability aspects of ingestion) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to N o. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 10 11 12 Subpart E – Design and Construction ; Turbine Aircraft Engines 43. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47. 33.85 Calibration tes ts 48. 33.87 Endurance test 49. 33.88 Engine overtemperature test 50. 33.89 Operation test (Note 2) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) Subpart F – Block Tests; Turbine Aircraft Engines 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 55. 33.94 Blade containment and rotor unbalance tests ( weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions

Next: Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. →

Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

4/30/10 AC 33 - 9 Appendix 2 Template 9 REPAIR SUBSTANTIATION CHECKLIST – LOW PR ESSURE COMPRESSOR (LPC) – HIGH PRESSURE COMPRESSOR (HPC) STATOR PART FAMILY – VANE SECTOR (AND FULL RING) TYPE STATORS Categories of LPC - HPC Stator Repair. Determine which repair description best fit s the repair proposal. If no repair description is app ropriate, contact the FAA Advisor for guidance .

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Restoration of Protective Coating (Paint, Aluminizing, Oil, etc.)

 This repair includes touch - up coating 2. Weld or Braze Repair  This repair excludes detail part replacement 3. Weld or Braze Repair  This repair includes detail part replacement 4. Assembly and/or Disassembly  This repair assembles, disassembles, removes and replaces detail parts, or sub - assemblies without use of permanent attachment techniques (i.e .; welding or brazing). Assembly is either bolted or riveted 5. Blend Repair 6. Dimensional Restoration by Coating or Plating 7. Surface Treatment Repair  This repair includes peening, vibratory tumble (e.g.; restoration of surface finish/texture) 8. St raightening, Re - twist, or Reforming Repair  This repair includes straightening of bent flanges 9. Restoration of Adhesives, Bonding Agents & Potting Compounds 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiat ed. Repair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine. This section pro vides the background for establishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. Wear due to: adhesion, abrasion, corros ion, erosion, cavitation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 Propertie s and Requirements to be Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, dwell time ) d. Creep e. Tensile Properties ( yield, strength, elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties : i. Chemical Composition ( alloy c onstituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance ( consider wear types in (1)(e)) o. Crack Propagation Rate Physical Pro perties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any c hanges to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (braz ing) d. Heat Affected Zone (welding) 4. Coating & Plating Material Properties Characteristics & Processes: a. Deposited Material Composition b. Thickness, Coverage & Uniformity c. Microstructure d. Hardness e. Sintering f. Strip Process g. Residual Stres s h. Lubricant Properties i. Spalling Resistance j. Thermal Resistance k. Erosion Resistance l. Bonding (Interface Contamination) m. Environmental Resistance n. Diffusion Zone o. Hydrogen Embrittlement Free (Plating) p. Compatibility With Base Material 4/30/10 AC 33 - 9 Appendix 2 C ATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

5. Select Surface Treatment that applies ( without material remo val ) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and a ssess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning (Chemical , power flash, Ultrasonic) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs q. Contamination 7. Establish t he Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req. Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 No. I dentified and Substantiated, Repair Properties and Requirements to be Identified and Substantiated.

Critical Measurable Characteristics 8. Select all that may be potentially affected by the repair design and evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen Intensity/Coverage c. Bearing bore dimensions and location characteristics d. Pressure Strength Test e. Flow Capacity test f. Dimensions, incl uding heat distortion effects  Roundness  Flatness  Parallelism  Concentricity  True Position Tolerances  Edge Distance  Requirements  Finish Dimensions Requirements g. Airfoil Profile h. Leading & Trailing Edge Contours i. Concave & Convex Contours j. Thickness k. Chord & Tip Length l. Twist/Lean/Bow Critical Measurable Characteristics 10. Outer Band Rail Functional Fit 11. Inner Band Arc Length 12. Outer Band to Inner Band Dim Relationship 13. Assembled Honeycomb Inner Radiu s 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 Repair Process Capability Technical Substantiation Requirements 14. Verification Plan with Sign ificant Operations Identified for Repair Source Qualification 15. Process Demonstration (including variability requirements) 16. Part Demonstration/Inspection 17. Manufacturing requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 18 . 33.4 Instructions for Continuous Airworthiness (ICA's) 19. 33.5 Instruction manual for installing and operating the engine 20. 33.7 Engine ratings and operating limitations 21. 33.8 Selection of engine power and thrust ra tings Subpart B – Design and Construction; General 22. 33.14 Start - stop cyclic stress (low cycle fatigue) 23. 33.15 Materials 24. 33.17 Fire prevention 25. 33.19 Durability (Note that 33.19 is associa ted with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 26. 33.21 Engine cooling 27. 33.23 Engine mounting attachments and structure 28. 33.25 Accessory attachments 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Proper ties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 Repair Process Capability Technical Substantiation Requirements Subpart B – Design and Construction; General 29. 33.27 Turbine, compressor, fan, and turbosupercharger 30. 33.28 Electrical and electronic control systems 31. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 32. 33.62 Stress analysis 33. 33.63 Vibration 34. 33.65 Surge and stall characteristics (Note 2) 35. 33.66 Bleed air system 36. 33.67 Fuel system 37. 33.68 Induction system icing ( operability aspects) (Note 2) 38. 33.69 Ignition s system 39. 33.71 Lubrication system 40. 33.72 Hydraulic actuating system s 41. 33.73 Power or thrust response 42. 33.74 Continued rotation 43. 33.75 Safety analysis 44. 33.76 Bird ingestion ( operability aspects of ingestion) 45. 33.77 Foreign object ingestion ( operability aspects of ingestion) 46. 33.78 Rain and hail ingestion 47. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 48. 33.83 Vibration test 55. 33.85 Calibration tests 49. 33.87 Endurance test 50. 33.88 Engine overtemperature test 51. 33.89 Operation test (Note 2) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF RE PAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 52. 33.90 Initial maintenance inspection 53. 33.91 Engine component tests (HCF/LCF bench testing) 54. 33.92 Rotor lock ing tests 55. 33.93 Teardown inspection 56. 33.94 Blade containment and rotor unbalance tests ( weight changes) 57. 33.95 Engine - propeller system tests 58. 33.96 Engine tests in auxiliary power unit (APU) mode 59. 33.97 Thrust reversers 60. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions

Next: Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance. →

Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance.

4/30/10 AC 33 - 9 Appendix 2 Template 10 REPAIR SUBSTANTIATION CHECKLIST – LOW PRESSURE COMPRESSOR (LPC) – HIGH PRESSER COMPRESSOR (HPC) STATOR PART FAMILY – FIXED VANE TYPE STATORS (CANTILEVERED AT O.D.)

Categories of LPC - HPC Stator Repair. Determine which repair description best fit s the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance .

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Dimensional Restoration by Coating or Plating 2. Weld or Braze Repair  This repair excludes detail part replacement 3. Blend Repair 4. Surface Treatment Repair  This repair includes peening, vibratory tumble (e.g.; restoration of surface finish/texture) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req R epair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 Properties and Requirements to be Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine.

This section provides the background for establishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. W ear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and S ubstantiated. Repair 1 2 3 4 Properties and Requirements to be Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design and assess their impact on the part’s airworthine ss: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composi tion (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (braz ing) d. Heat Affected Zone (welding) 4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s physical and operational capability as a result of th e coating should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Coating and Diffusion Zone Microstructure d. Coating Hardness e. Sintering f. Strip Requirements/Process g. Residual Stress h. Resistance to Spalling i. Th ermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding ( interface contamination ) l. Hydrogen Embrittlement ( plating ) m. Compatibility with Base Material/Other Coatings 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Propert ies & Requirement to be No. Identified and Substantiated. 1 2 3 4 5. Select Surface Treatment that applies ( without material removal ) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazin g or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning (Chemical, power flash, Ultrasonic) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmospher e, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Contamination 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirement to be No. Identified and Substantiated. 1 2 3 4 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design and evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight Critical Measurable Characteristic s 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen intensity/covera ge c. Bearing bore dimensions and d. location characteristics e. Pressure strength t est f. Flow capacity te st g. Dimensions, including heat distortion effects :  Roundness  Flatness  Parallelism  Concentricity  True position tolerances  Edge distance requiremen ts  Finish dimensions requirements Airfoil Profile  Leading & Trailing Edge Contours  Concave & Convex Contours  T hickness  Chord & Tip Length Twist/Lean/Bow 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Repair Properties & Requirement to be 1 2 3 4 Identified and Substantiated.

Critical Measurable Characteristics 10. Outer Band Rail Functional Fit 11. Inner Band A rc Length 12. Outer Band to Inner Band Dim Relationship 13. Assembled Honeycomb Inner Radius Repair Process Capability Technical Substantiation Requirements 14. Technical Plan with Significant Operations Identified 15. Proces s Demonstration (including variability requirements) 16. Part Demonstration/Inspection 17. Manufacturing requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality R equirements  Source Substantiation Requirements 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 Applicable 14 CFR Part 33 Requirements Subpart A – General 18. 33.4 I nstructions for Continuous Airworthiness (ICA's) 19. 33.5 Instruction manual for installing and operating the engine 20. 33.7 Engine ratings and operating limitations 21. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 22. 33.14 Start - stop cyclic stress (low cycle fatigue) 23. 33.15 Materials 24. 33.17 Fire prevention 25. 33.19 Durability(Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 3 3.90 ) 26. 33.21 Engine cooling 27. 33.23 Engine mounting attachments and structure 28 33.25 Accessory attachments 29. 33.27 Turbine, compressor, fan, and turbosupercharger rotors 30. 33.28 Electrical and electronic control sy stems 31. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 32. 33.62 Stress analysis 33. 33.63 Vibration 34. 33.65 Surge and stall characteristics (Note 2) 35. 33.66 Bleed air sy stem 36. 33.67 Fuel system 37. 33.68 Induction system icing ( operability aspects) (Note 2) 38. 33.69 Ignition s system 39. 33.71 Lubrication system 40. 33.72 Hydraulic actuating system s 41. 33.73 Power or thrust response 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 Subpart E – Design and Construction ; Turbine Aircraft Engines (continued) 42. 33.74 Continued rotation 43. 33.75 Saf ety analysis 44. 33.76 Bird ingestion ( operability aspects of ingestion) 45. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 46. 33.78 Rain and hail ingestion 47. 33.79 Fuel burning thrust augment o r Subp art F – Block Tests; Turbine Aircraft Engines 48. 33.83 Vibration tests 49. 33.85 Calibration tests 50. 33.87 Endurance tests 51. 33.88 Engine overtemperature test 52. 33.89 Operation test (Note 2) 53. 33.90 Initial mai ntenance inspection 54. 33.91 Engine component tests (HCF/LCF bench testing) 55. 33.92 Rotor locking tests 56. 33.93 Teardown inspection 57. 33.94 Blade containment and rotor unbalance tests (Weight changes) 58. 33.95 Engine - propeller system tests 59. 33.96 Engine tests in auxiliary power unit (APU) mode 60. 33.97 Thrust reversers 61. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - App endix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions

Next: Categories of Major Cases Part Family. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. →

Categories of Major Cases Part Family. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

4/30/10 AC 33 - 9 Appendix 2 Template 11 REPAIR SUBSTANTIATION CHECKLIST -- MAJOR ENGINE CASES Categories of Major Cases Part Family. Determine which repair descri ption best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Weld or Braze Repair  This repair includes detail part replacement 2. Weld or Braze Repair  T his repair excludes detail part replacement 3. Straightening, Re - twist or Reforming Repair  This repair includes dent repair 4. Dimensional Restoration by Coating or Plating 5. Restoration of Adhesives, Bonding Agents , Potting Compound .

6. Bushing or He licoil Repair 7. Restoration of Protective Coating  Includes touch - up coating 8. Assembly and/or Disassembly  This repair assembles, disassembles, removes and replaces detail parts, or sub - assemblies without the use of permanent attachment techniques (i.e. ; welding or brazing).

Assembly is either bolted or riveted .

9. Remove and Restore Anti - gallant 10. Blend Repair 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIRS Req Repair Design Requirements to be Identified 1 2 3 4 5 6 7 8 9 10 No. and Substantiated. Repair Properties and Requirements to be I dentified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine.

This section provides the background for establishing the substantiat ion requirements.

a. Thermo - mechanical fatig ue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidatio n f. High - c ycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req. Repair Design Requirements to be 1 2 3 4 5 6 7 8 9 10 No. Identified and Substantiated. Repair Properties and Requirements to be Identified and Substantia ted 2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughnes s c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - bou ndary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance (Consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal E xpansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIRS Req Repair Design Requirements to be Identified 1 2 3 4 5 6 7 8 9 10 No. and Substantiated. Repair Properties and Requirements to be Identified and Substantiated .

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or br aze should be evaluated for airworthiness.

4 Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s physical and operational capability as a result of the coating should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Coating and Diffusion Zone Microstructure d. Coating Hardness e. Sintering f. Strip Requirements/Process g. Residual Stress h. Resis tance to Spalling i. Thermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding (Interface Contamination) l. Hydrogen Embrittlement ( plating ) m. Compatibility With Base Material/Other Coatings 5. Select Surface Tre atment that applies (Without Material Removal) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIRS Req Repair Design Requirements to be Identified 1 2 3 4 5 6 7 8 9 10 No. and Substantiated. Repair Properties and Requirements to be Identified and Substantiated.

6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if an y, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning ( chemical, power flash, ultraso nic) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Contamination 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIRS Req Re pair Properties and Requirements to be 1 2 3 4 5 6 7 8 9 10 No. Identified and Substantiated.

7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design, and evaluate system effect(s): Critical Measurable Characteristics 9. Hole dimensions and location characteristics 10. Flange & Case Wall thickness & configuration 11. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface f inish/texture b. Shotpeen intensity / coverage c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, including heat distortion effects  Roundness  Flatness  Parallelism  Concentricity  True position tolerances  Edg e distance requirements  Finish dimensions requirements Repair Process Capability Technical Substantiation Requirements 12. Verification Plan with Significant Operations Identified for Repair Source Qualification 13. Pr ocess Demonstration (including variability requirements) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIRS Req Repair Properties and Requirements to be 1 2 3 4 5 6 7 8 9 10 No. Identified and Substantiated.

14. Part Demonstration/Inspection 15. Manufact uring requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuous Airworthiness (ICA's) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIRS Req Repair Properties and Requirements to be 1 2 3 4 5 6 7 8 9 10 No. Identified and Substantiated.

17. 33.5 Instructi on manual for installing and operating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 20. 33.1 4 Start - stop cyclic stress (low cycle fatigue) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 24. 33.21 En gine cooling 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments 27. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 28. 33.28 Electrical and electronic control systems 29. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characteristics (Note 2) 33. 33.66 Bleed air system 34. 33.67 Fuel system 35. 33.68 Induction system icing ( operability aspects) (Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIRS Req Repair Properties and Requirements to be 1 2 3 4 5 6 7 8 9 10 No. Identified and Substantiated.

Subpart F – Block Tests; Turbine Aircraft Engines 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operability aspects of ingestion) 43. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47. 33.85 Calibration tests 48. 33.87 Endura nce test 49. 33.88 Engine overtemperature test 50. 33.89 Operation test (Note 2) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 55. 33.94 Blade containment and rotor unbalance tests ( weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentration s of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 12 REPAIR SUBSTANTIATION CHECKLIST - MAJOR ROTATING (NON - LIFE LIMITED) PART FAMILY (EXCLUDING TURBINE SHAFT COUPLING PART FAMILY) Categories of Major Rotating (Non - Life L imited) Part Repairs. Determine which repair description best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance .

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Restoration of Protective Coating (Paint , Aluminizing, Oil, etc.)

 Includes touch - up coating 2. Weld or Braze Repair  This repair excludes detail part replacement 3. Assembly and/or Disassembly  This repair assembles, disassembles, removes and replaces detail parts, or sub - assemblies without use of permanent attachment techniques (i.e.; welding or brazing).

Assembly is either bolted or riveted 4. Blend Repair 5. Remove and Restore Anti - gallant 6. Dimensional Restoration by Coating or Plating 7. Bushing/Helicoil Repair 8. Honing Repair 9. Mac hining Repair  This repair includes lapping, skim cut, non - conventional machining 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

a. Thermo - mechanical fatigu e b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High - cycle fatigu e g. Rubbing, fore ign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, dwell time) d. Creep e. Tensile Properties ( yield, strength, elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition ( alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gam ma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance ( consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Ind ex (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be ev aluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Coating & Pla ting Material Properties Characteristics & Processes: a. Deposited Material Composition b. Thickness, Coverage & Uniformity c. Microstructure d. Hardness e. Sintering f. Strip Process g. Residual Stress h. Lubricant Properties i. Spalling Resi stance j. Thermal Resistance k. Erosion Resistance l. Bonding ( interface contamination ) m. Environmental Resistance n. Diffusion Zone o. Hydrogen Embrittlement Free ( plating ) p. Compatibility with Base Material 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

5. Select Surface Treatment that applies (Without Material Removal) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on e xisting ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning ( ch emical, power flash, ultrasonic ) k. Res idual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Contamination 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. R epair 1 2 3 4 5 6 7 8 9 Properties and Requirements to be Identified and Substantiated.

8. Select all that may be potentially affected by the repair design, and evaluate system effect(s): a. Structural Strength, including major load pa ths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and f or any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen intensity / coverage c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, including heat g. Distort ion effects  Roundness  Flatness  Parallelism  Concentricity  True Position Tolerances  Edge Distance Requirements  Finish Dimensions Requirements 10. Coating Coverage Definition 11. Blend Area Proximity Limits Defined 12. No Gri t Blast/Coating in Fillet Radii 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 Repair Process Capability Technical Substantiation Requirements 1 3. Verification Plan with Significant Operations Identified for Repair Source Qualification 14. Process Demonstration (including variability requirements) 15. Part Demonstration/Inspection 16. Manufacturing requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Sub part A – General 17. 33.4 Instructions for Continuous Airworthiness (ICA's) 18. 33.5 Instruction manual for installing and operating the engine 19. 33.7 Engine ratings and operating limitations 20. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 21. 33.14 Start - stop cyclic stress (low cycle fatigue) 22. 33.15 Materials 23. 33.17 Fire prevention 24. 33.19 Durabili ty (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 25. 33.21 Engine cooling 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 Subpart B – Design and Construction; General 26. 33.23 Engine mounting attachments and structure 27. 33.25 Accessory attachments 28. 33.27 Turbine, compressor, fan, and turbo - supercharger 29. 33.28 Electrical and electronic control systems 30. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 31. 33.62 Stress analysis 32. 33.63 Vibration 33. 33.65 Surge an d stall characteristics (Note 2) 34. 33.66 Bleed air system 35. 33.67 Fuel system 36. 33.68 Induction system icing ( operability aspects) (Note 2) 37. 33.69 Ignition s system 38. 33.71 Lubrication syste m 39. 33.72 Hydraulic actuating system s 40. 33.73 Power or thrust response 41. 33.74 Continued rotation 42. 33.75 Safety analysis 43. 33.76 Bird ingestion ( operability aspects of ingestion) 44. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 45. 33.78 Rain and hail ingestion 46. 33.79 Fuel burning thrust augment o r 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 9 Subpart F – Block Tests; Turbine Aircraft Engines 47. 33.83 Vibration test 48. 33.85 Calibration tests 49. 33.87 Endurance test 50. 33.88 Engine overt emperature test 51. 33.89 Operation test (Note 2) 52. 33.90 Initial maintenance inspection 53. 33.91 Engine component tests (HCF/LCF bench testing) 54. 33.92 Rotor locking tests 55. 33.93 Teardown ins pection 56. 33.94 Blade containment and rotor unbalance tests ( weight changes) 57. 33.95 Engine - propeller system tests 58. 33.96 Engine tests in auxiliary power unit (APU) mode 59. 33.97 Thrust reversers 60. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - – Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emiss ions 4/30/10 AC 33 - 9 Appendix 2 Template 13 REPAIR SUBSTANTIATION CHECKLIST – HIGH PRESSURE COMPRESSOR (HPC)/HIGH PRESSURE TURBINE (HPT)/LOW PRESSURE TURBINE (LPT) AIRSEALS (NON - ROTATING) AND SHROUDS (STATIONARY) PART FAMILY Categories of HPC/HPT/LPT Airseals (non - rotating) and Shrouds (stationary) Part Family Repair. Determine which repair description best fit the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Assembly and/or Disassembly  This repair assembles, disassembles, removes and replaces detail parts, or sub - assemblies without use of permanent attachment techniques (i.e.; welding or brazing). Assembly is either bolted or riveted 2. Blend Repair 3. Strip and Re - coat Repair  This repair removes and replaces any and all types of coatings 4. Dimensional Restoration by Coating or Plating 5. Weld or Braze Repair  This repair excludes detail part replacement) 6. Weld or Braze Repair  This repair includes part detail r eplacement 7. Straightening, Re - twist or Reforming Repair  This repair includes dent repair 8. Machining Repair  This repair includes lapping, skim cut, non - conventional machining 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identi fied and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

1. Applicable Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine.

This section provides the background for establishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Rep air 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design , and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, dwell time ) d. Creep e. Tensile Properties ( yield, strength, elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composi tion ( alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance ( consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repai r 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze, should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s physical and operational cap ability as a result of the coating should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Coating and Diffusion Zone Microstructure d. Coating Hardness e. Sintering f. Strip Requirements/Process g. Residual Str ess h. Resistance to Spalling i. Thermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding ( interface contamination ) l. Hydrogen Embrittlement ( plating ) m. Compatibility with Base Material/Other Coatings 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 5. Select Surface Treatment that applies (Without Material Removal) and evaluate effect(s), if any, on airworthiness: a. Burnishi ng b. Peening c. Butterfly Polish d. Mass Media Finishing 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Br oaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning ( chemical, power flash, ultrasonic ) k. Residual Plating, Stripping, or Cleaning Agents l. Stre ss Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Contamination 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate an y changes to an existing repair sequence for potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design and evaluate system effect(s): a. Structural Strength, including major lo ad paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen intensity/covera ge c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, including heat distortion effects 1) Roundness 2) Flatness 3) Parallelism 4) Concentricity 5) True Position Tolerances 6) Edge Distance 7) Requirements 8) Finish Dimensi ons Requirements Critical Measurable Characteristics 10. Coating Coverage Definition: a. No Grit Blast b. No coating in Filet Radii 11. Blend Area Proximity Limits Defined Repair Process Capability Technical Sub stantiation Requirements 12. Technical Plan with Significant Operations Identified 13. Process Demonstration (including variability requirements) 14. Part Demonstration/Inspection 15. Manufacturing requirements for f abrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuous Airworthiness (ICA's) 17. 33.5 Instruction manual for installing and op erating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust ratings Applicable 14 CFR Part 33 Requirements Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 24. 33.21 Engine cooling 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments 27. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 28. 33.28 Electrical and electronic control system s 29. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characteristics (Note 2) 33 . 33.66 Bleed air system 34. 33.67 Fuel system 35. 33.68 Induction system icing ( operability aspects) (Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 41. 33.75 Safety analysis 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 Subpart E – Design and Construction ; Turbine Aircraft Engines 42. 33.76 Bird ingestion ( operability aspects of ingestion) 43. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration tests 47. 33.85 Calibration tests 48. 33.87 Endurance tests 49. 33.88 Engin e overtemperature test 50. 33.89 Operation test (Note 2) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown i nspection 55. 33.94 Blade containment and rotor unbalance tests (Weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 14 REPAIR SUBSTANTIATION CHECKLIST - STATIC STRUCTURE PART FAMILY (Ducts, Bearing Housings, Etc.)

Categories of Static Structure Parts Family Repairs. Determine which repair description best fit s the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance.

CATEGORIES OF REPAIR DESCRIPTION REPAIRS 1. Blend Repair 2. Weld/Braze Repairs  Excludes Detail Part Replacement 3. Weld/Braze Repairs  Includes Detail Part Replacement 4. Assemb ly and/or Disassembly  This repair removes and replaces detail parts without the use of permanent attachment.

Techniques, i.e., welded or brazed, assembly is either bolted or riveted.

5. Dimensional Restoration Coating or Plating 6. Straightening, Re - tw ist or Reforming Repair  This repair includes dent repair.

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 Properties and Requirements to be Identified and Substantiated.

1. Applic able Degradation Modes : Select all that apply based on the function of the part and its operating environment in the engine. This section provides the background for establishing the substantiation requirements.

a. Thermo - mechanical fatigue b. Oxidati on c. Corrosion d. Elevated temperature - induced changes ( creep, diffusion, ageing, temperature gradients ) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign object impact damage, O chemical a ttack, etc .

2. Select all mechanical, metallurgical, and phy sical properties of the part affected by the repair design , and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties ( yield, strength, elongation ) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition ( alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Melting Point l. C orrosion Resistance m. Oxidation Resistance n. Wear Resistance ( consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of Inertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 Properties and Requirements to be Identified and Substantiated.

3. Select all Material Properties/Characteristics for weldment s or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 Properties and Requirements to be Identified and Substantiated.

4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s p hysical and operational capability, as a result of the coating, should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Coating and Diffusion Zone Microstructure d. Coating Hardness e. Sintering f. Strip Requir ements/Process g. Residual Stress h. Resistance to Spalling i. Thermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding ( interface contamination ) l. Hydrogen Embrittlement (Plating) m. Compatibility with Base Material/Other Coating s Material Properties/Degradation Modes/Product Qualities/etc. Technical Substantiation Requirements 5. Select Surface Treatment that applies (Without Material Removal) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirement to No be Identified and Substantiated. 1 2 3 4 5 6 6. Evaluate any degradation in the part’s function or durability due to the follo wing processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning (Chemical, power flash, Ultrasonic) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Conta mination 7. Cleaning Properties, Characteristics & Material Property Debits: a. Chemical ( solutions , etc.)

b. Grit Blast ( ,pressure media etc.)

c. Power Flush ( pressure, solution time, temp, et c . ) d. Ultrasonic ( solution frequency, time, etc. ) e. Furna ce ( time, temp, atmosphere , etc.)

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirement to No be Identified and Substantiated. 1 2 3 4 5 6 8. Select all that may be potentially affected by the repair design and evaluate system effec t(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight Critical Measurable Characteristics 9. Establish Measurable Characteristics and the allo wable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen Intensity/Coverage c. Bearing bore dimensions and location characteristics d. Pressure Strength Test e. Flow Capacity test f. Dimensions, including h eat distortion effects  Roundness  Flatness  Parallelism  Concentricity  True Position Tolerances  Edge Distance  Requirements  Finish Dimensions Requirements 10. Parent material thickness reduction assessment 11. Dimensional & Tolerance Reverse engineered parts Repair Process Capability Technical Substantiation Requirements 12. Verification Plan with Significant Operations Identified for Repair Source Qualification 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES O F REPAIR Req Repair Properties & Requirement No to be Identified and Substantiated. 1 2 3 4 5 6 13. Process Demonstration:  Including variability requirements 14. Part Demonstration/Inspection 15. Manufacturing requirem ents for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – G eneral 16. 33.4 Instructions for Continuous Airworthiness (ICA's) 17. 33.5 Instruction manual for installing and operating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) (weight and CG location changes effects on disks) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 24. 33.21 Engine cooling 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments 27. 33.27 Turbin e, compressor, fan, and turbo supercharger rotors 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirement to No be Identified and Substantiated. 1 2 3 4 5 6 Subpart B – Design and Construction; General ; continued 28. 33.28 El ectrical and electronic control systems 29. 33.29 Instrument Control Subpart E – Design and Construction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characterist ics ( Note 2 ) 33. 33.66 Bleed air system 34. 33.67 Fuel system 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements No to be Identified and Substantiated. 1 2 3 4 5 6 Subpart E – Design and Construction ; Turbine Ai rcraft Engines 35. 33.68 Induction system icing 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operability aspects of ingestion) 43. 33.77 Foreign object ingestion — ice ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning t hrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47. 33.85 Calibration tests 48. 33.87 Endurance test (see Note 2 ) 49. 33.88 Engine overtemperature test 50 33.89 Oper ation test ( operability aspects) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 55. 33.94 Blade containme nt and rotor unbalance tests ( weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Par t 33 — Appendix A – Instructions DER for Continued Airworthiness Part 33 — Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 15 REPAIR SUBSTANTIATION CHECKLIST – LOW PRESSURE COMPRESSOR (LPC) – HIGH PRESSURE COMPRESSOR (HPC) STATOR PART FAMILY – VARIABLE VANE TYPE STATORS Categories of LPC - HPC Stator Repair. Determine which repair description best fit s the repair proposal based. If no repair description is app ropriate, contact the FAA Advisor for guidance .

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Weld or Braze Repair  This repair excludes detail part replacement 2. Blend Repair 3. Dimensional Restoration by Coating or Plating 4. Surface Treatment Repair  This repair includes peening, vibratory tumble (e.g.; restoration of surface finish/texture) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be Identified No. and Substantiated. Repair Properties and 1 2 3 4 Requirements to be Identified and Substa ntiated.

a. Th ermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High - cycle fatigue g. Rubbing, foreign obje ct impact damage, O chemical attack, etc .

4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be Identified No. and Substantiated. Repair Properties and 1 2 3 4 Requirements to be Identified and Substantiated.

2. Select all mechanical , metallurgical, and physical properties of the part affected by the repair design , and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tens ile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction , etc.)

3. Select all Material Properties/Characteris tics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (gra in size, grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Select all Coating Properties/Characteristics that apply and evaluate them an d their interface with the parent metal. The effect of any changes to the part’s physical and operational capability as a result of the coating should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Co ating and Diffusion Zone Microstructure d. Coating Hardness e. Sintering f. Strip Requirements/Process g. Residual Stress h. Resistance to Spalling i. Thermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding ( interface contamination ) l. Hydrogen Embrittlement ( plating ) m. Compatibility with Base Material/Other Coatings 5. Select Surface Treatment that applies ( without material remova l) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass M edia Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirement to be No. Identified and Substantiated. 1 2 3 4 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and a ssess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning ( chemical, pow er flash, ultrasonic) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Contamination 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on t he airworthiness of the part.

Concentricity 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Proper ties and Requirements to be No. Identified and Substantiated, Cont’d. 1 2 3 4 Repair Process Capability Technical Substantiation Requirements 14. Technical Plan with Significant Operations Identified 15. Process Demonstration (including va riability requirements) 16. Part Demonstration/Inspection 17. Manufacturing requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantia tion Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 18. 33.4 Instructions for Continuous Airworthiness (ICA's) 19. 33.5 Instruction manual for installing and operating the engine 20. 33.7 Engine rati ngs and operating limitations 21. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 22. 33.14 Start - stop cyclic stress (low cycle fatigue) 23. 33.15 Materials 24. 33.17 Fire preven tion 25. 33.19 Durability(Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 26. 33.21 Engine cooling 27. 33.23 Engine mounting attachments and structure 28. 33.25 Accessory attachments 29. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 30. 33.28 Electrical and electronic control systems 31. 33.29 Instrument connection Subpart E – Design and Construction ; Turbine Aircraft Engines 32. 33.62 Stress Analysis 33. 33.63 Vibration 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Identified and Substantiated. 1 2 3 4 Subpart E – Design and Construction ; Turbine Aircraft Engines 34. 33.65 Surge and stall characterist ics (Note 2) 35. 33.66 Bleed air system 36. 33.67 Fuel system 37. 33.68 Induction system icing ( operability aspects) (Note 2) 38. 33.69 Ignition s system 39. 33.71 Lubrication system 40. 33.72 Hydraulic actuating system s 41. 33.73 Power or thrust response 42. 33.74 Continued rotation 43. 33.75 Safety analysis 44. 33.76 Bird ingestion ( operability aspects of ingestion) 45. 33.77 Foreign object ingestion ( operability aspects of ingestion) 46. 33.78 Rain and hail ingestion 47. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 48. 33.83 Vibration test 49. 33.85 Calibration tests 50. 33.87 Endurance test 51. 33.88 Engine overtemperature test 52. 33.89 Operation test (Note 2) 53. 33.90 Initial maintenance inspection 54. 33.91 Engine component tests (HCF/LCF bench testing) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to be No. Ide ntified and Substantiated. 1 2 3 4 Subpart F – Block Tests; Turbine Aircraft Engines 55. 33.92 Rotor locking tests 56. 33.93 Teardown inspection 57. 33.94 Blade containment and rotor unbalance tests ( weight changes) 58. 33.9 5 Engine - propeller system tests 59. 33.96 Engine tests in auxiliary power unit (APU) mode 60. 33.97 Thrust reversers 61. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions 4/30/10 AC 33 - 9 Appendix 2 Template 16 REPAIR SUBSTANTIATION CHECKLIST - HPT VANE PART FAMILY Categories of HPT Vane Repair. Determine which repair des cription best fit s the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

CATEGORIES REPAIR DESCRIPTION OF REPAIRS 1. Strip and Re - coat Repair  This repair removes and replaces any and all types of coatings.

2. Weld or Braze Repair (excludes detail parts replacement)  Includes restoration of airfoil tip and chord length 3. Weld or Braze Repair  Includes detail parts replacement 4. Assembly and/or disassembly  This repair removes and replaces details parts wi thout the use of permanent attachment techniques (i.e., welding or brazing) but assembly is either bolted or riveted.

5. Blend Repair 6. Dimensional Restoration by Coating or Plating 7. Straightening, Re - twist or Reforming Repair 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 Properties and Requirements to be Identified and Substantiated.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes ( creep, diffusion, a geing, temperature gradients ) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc .

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design , an d assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequ encies Metallurgical Properties: i. Chemical Composition (Alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

3. Select all Material Properties/Characteristics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size, grain shape, grain boundary precipitates, gamma prime siz e and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect of any cha nges to the part’s physical and operational capability, as a result of the coating, should be evaluated for airworthiness.

5. Select Surface Treatment tha t applies (Without Material Removal) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirement to be No. Ident ified and Substantiated. 1 2 3 4 5 6 7 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its impact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning ( chemical, power flash, ultrasonic ) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensit y Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Contamination 7. Establish the Applicability of the Repair and the Repair Processing Sequence or evaluate an y changes to an existing repair sequence for potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design, and evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 Critical Measurable Ch aracteristics 9. Dimension of sealing features (leakage, secondary circuits) 10. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface finish/texture b. Shotpeen intensity / coverage c. Bearing bore dimensions and location characteristics d. Pressure strength test e. Flow capacity test f. Dimensions, including heat distortion effects  Roundness  Flatness  Parallelism  Concentricit y  True position tolerances  Edge distance  Requirements  Finish dimensions  Requirements g. Airfoils Profile  Leading & trailing edge contour  Concave & convex contours  Thickness  Chord & airfoil length  Twist/ lean / bow h. Tip length i. Airfoil wall thickness j. Throat area 11. Cooling (Total flow, flow split, back flow margin, hole exit geometry, allowable plugged holes) Repair Process Capability Technical Substantiation Requirements 12. Technical Plan with Significant Operations Identified 13. Process Demonstration (including variability requirements) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 Repair Process Capability Technical Substantiation Requirements 14. Part Demonstration/Inspection 15. Manufacturing requirements for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiat ion Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuous Airworthiness (ICA's) 17 33.5 Instruction manual for installing and operating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine power and thrust ratings Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 21. 33. 15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.19 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 24. 33.21 Engine cooling 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments Subpart B – Design and Construction; General 27. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 28. 33.28 Electrical and electronic control systems 29. 33.29 Instr ument connection Subpart E – Design and construction ; Turbine aircraft Engines 30. 33.62 Stress Analysis 31. 33.63 Vibration 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Subs tantiated. 1 2 3 4 5 6 7 32. 33.65 Surge and stall characteristics (Note 2) 33. 33.66 Bleed air system 34. 33.67 Fuel system 35. 33.68 Induction system icing ( operability aspects) (Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operabilit y aspects of ingestion) 43. 33.77 Foreign object ingestion ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thrust augment o r Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47. 33.85 Calibration tests 48. 33.87 Endurance test 49. 33.88 Engine overtemperature test 50. 33.89 Operation test (Note 2) 51. 33.90 Initial maintenance inspection 5 2. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 55. 33.94 Blade containment and rotor unbalance tests ( weight changes) 56. 33.95 Engine - propeller system tests 57 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appen dix B – Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions

Next: Categories of LPT Vane Part Family Repair. Determine which repair description best fit the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance. →

Categories of LPT Vane Part Family Repair. Determine which repair description best fit the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance.

4/30/10 AC 33 - 9 Appendix 2 Template 17 REPAIR SUBSTANTIATION CHECKLIST - LOW PRESSURE TURBINE (LPT) VANE PART FAMILY Categories of LPT Vane Part Family Repa ir. Determine which repair description best fit the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance.

6. Blend Repair 7. Dimensional Restoration Repair (by coating of plating) 8 . Straightening, Re - twist, or Reforming Repair 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

a. Thermo - mechanical fatigue b. Oxidation c. Corrosion d. Elevated temperature - induced changes (creep, diffusion, ageing, temperature gradients ) e. Wear due to: adhesion, abrasion, corrosion, erosion, cavitation, fretting, oxidation f. High cycle fatigue g. Rubbing, foreign object impact damage, O chemical attack, etc.

2. Select all mechanical, metallurgical, and physical properties of the part affected by the repair design , and assess their impact on the part’s airworthiness: Mechanical Properties: a. Stress - Strain b. Fracture Toughness c. Fatigue Strength (S - N, Goodman, Dwell Time) d. Creep e. Tensile Properties (Yield, Strength, Elongation) f. Hardness g. Young’s Modulus h. Natural Frequencies Metallurgical Properties: i. Chemical Composition ( alloy constituents) j. Microstructure (grain size – shape - boundary precipitates, gamma prime size and volume fraction, etc.)

k. Meltin g Point l. Corrosion Resistance m. Oxidation Resistance n. Wear Resistance ( consider wear types in (1)(e)) o. Crack Propagation Rate Physical Properties: p. Density (weight) q. Coefficient of Thermal Expansion r. Refractive Index (X - Rays) s. Center of Gravity t. Polar Moment of I nertia 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identified and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

3. Select all Material Properties/Characteris tics for weldments or brazed joints that apply and evaluate them and their interface with the parent metal. The effect of any changes to the part’s metallurgy as a result of welds or braze should be evaluated for airworthiness.

a. Microstructure (grain size , grain shape, grain boundary precipitates, gamma prime size and volume fraction, etc.)

b. Porosity (weldment) c. Diffusion Zone (brazing) d. Heat Affected Zone (welding) 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Design Requirements to be No. Identi fied and Substantiated. Repair 1 2 3 4 5 6 7 8 Properties and Requirements to be Identified and Substantiated.

4. Select all Coating Properties/Characteristics that apply and evaluate them and their interface with the parent metal. The effect o f any changes to the part’s physical and operational capability as a result of the coating should be evaluated for airworthiness.

a. Coating Material Composition b. Thickness, Coverage & Uniformity c. Coating and Diffusion Zone Microstructure d. Coating Ha rdness e. Sintering f. Strip Requirements/Process g. Residual Stress h. Resistance to Spalling i. Thermal Resistance (coefficient of thermal expansion for the coating) j. Erosion Resistance k. Bonding (Interface Contamination) l. Hydrogen Embrittlement ( plating ) m. Compatibility wit h Base Material/Other Coatings 5. Select Surface Treatment that applies (Without Material Removal) and evaluate effect(s), if any, on airworthiness: a. Burnishing b. Peening c. Butterfly Polish d. Mass Media Finishing 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties & Requirement to be No. Identified and Substantiated. 1 2 3 4 5 6 7 8 6. Evaluate any degradation in the part’s function or durability due to the following processes, when applicable, and assess its i mpact, if any, on existing ICAs.

a. Machining, Milling, Broaching, or Grinding b. Non - traditional Machining c. Welding, Brazing or Coating d. Straightening, Re - twisting, Re - forming e. Blending f. Honing g. Lapping h. Grit Blast i. Stripping j. Cleaning ( chemical, power flas h, ultrasonic ) k. Residual Plating, Stripping, or Cleaning Agents l. Stress Intensity Factor (K ) t m. Heat Treatment (time, temp, atmosphere, etc . ) n. Plating o. Dimensional Short - falls p. Repetitive or Conflicting Repairs Contamination 7. Establish t he Applicability of the Repair and the Repair Processing Sequence or evaluate any changes to an existing repair sequence for potential impact on the airworthiness of the part.

8. Select all that may be potentially affected by the repair design an d evaluate system effect(s): a. Structural Strength, including major load paths b. Heat Transfer c. Secondary Airflow d. Aerodynamics e. Weight f. Center of Gravity g. Moment of Weight 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 Critical Measurable Characteristics 9. Cooling (Total flow, flow split, back flow margin, hole exit geometry/angle/location, cross over hole size, metering plate) 10. Dimens ion of sealing features (leakage, secondary circuits) 11. Establish Measurable Characteristics and the allowable tolerances for the repaired part features and for any replacement detail(s) and give due consideration to mating part(s): a. Surface fin ish/texture b. Shotpeen Intensity/Coverage c. Bearing bore dimensions and location characteristics d. Pressure Strength Test e. Flow Capacity test f. Dimensions, including heat distortion effects  Roundness  Flatness  Parallelism  Concentricity  True Position  Tolerances  Edge Distance  Requirements  Finish Dimensions  Requirements g. Airfoils Profile  Leading and Trailing Edge Contour  Concave and convex contours  Thickness  Chord and Airfoil Length  Twist/Lean/Bow h. Tip Length i. Airfoil wall thickness j. Throat Area Repair Proces s Capability Technical Substantiation Requirements 12. Verification Plan with Significant Operations Identified for Repair Source Qualification 13. Process Demonstration (including variability requirements) 14. Part Demonstrat ion/Inspection 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 Repair Process Capability Technical Substantiation Requirements 15. Manufacturing require ments for fabrication of repair details or replacement sections used to accomplish repair:  Drawings/Specifications  Quality Requirements  Source Substantiation Requirements Applicable 14 CFR Part 33 Requirements Subpart A – General 16. 33.4 Instructions for Continuous Airworthiness (ICA's) 17. 33.5 Instruction manual for installing and operating the engine 18. 33.7 Engine ratings and operating limitations 19. 33.8 Selection of engine po wer and thrust ratings Subpart B – Design and Construction; General 20. 33.14 Start - stop cyclic stress (low cycle fatigue) 21. 33.15 Materials 22. 33.17 Fire prevention 23. 33.19 Durability (Note that 33.1 9 is associated with 33.27; 33.63; 33.83; 33.87; 33.88; and 33.90 ) 24. 33.21 Engine cooling 25. 33.23 Engine mounting attachments and structure 26. 33.25 Accessory attachments 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair P roperties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 Subpart B – Design and Construction; General 27. 33.27 Turbine, compressor, fan, and turbo - supercharger rotors 28. 33.28 Electrical and electro nic control systems 29. 33.29 Instrument connection Subpart E – Design and construction ; Turbine Aircraft Engines 30. 33.62 Stress analysis 31. 33.63 Vibration 32. 33.65 Surge and stall characteristics (No te 2) 33. 33.66 Bleed air systems 34. 33.67 Fuel system 35. 33.68 Induction system icing ( operability aspects) (Note 2) 36. 33.69 Ignition s system 37. 33.71 Lubrication system 38. 33.72 Hydraulic actuating system s 39. 33.73 Power or thrust response 40. 33.74 Continued rotation 41. 33.75 Safety analysis 42. 33.76 Bird ingestion ( operability aspects of ingestion) 43. 33.77 Foreign object ingestion — ic e ( operability aspects of ingestion) 44. 33.78 Rain and hail ingestion 45. 33.79 Fuel burning thrust augment o r 4/30/10 AC 33 - 9 Appendix 2 CATEGORIES OF REPAIR Req Repair Properties and Requirements to No. be Identified and Substantiated. 1 2 3 4 5 6 7 8 Subpart F – Block Tests; Turbine Aircraft Engines 46. 33.83 Vibration test 47. 33.85 Calibration tests 48. 33.87 Endurance test 49. 33.88 Engine overtemperature test 50. 33.89 Operation tes t (Note 2) 51. 33.90 Initial maintenance inspection 52. 33.91 Engine component tests (HCF/LCF bench testing) 53. 33.92 Rotor locking tests 54. 33.93 Teardown inspection 55. 33.94 Blade containment and roto r unbalance tests ( weight changes) 56. 33.95 Engine - propeller system tests 57. 33.96 Engine tests in auxiliary power unit (APU) mode 58. 33.97 Thrust reversers 59. 33.99 General conduct of block tests Part 33 - Appendix A – Instructions for Continued Airworthiness Part 33 - Appendix B - Certification Standard Atmospheric Concentrations of Rain and Hail Part 34 – Exhaust Emissions

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Document details

Doc number: AC 33-9
Publisher: FAA
Pages: 176
File size: 3.3 MB
Chapters: 7

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Figure A1.2. Part Interaction Considerations View in PDF

Indirect Effect

Part Interaction

Considerations

• Fluid interactions

• Air, fuel, oil

Indirect Effect

• Direct interactions

• Mechanical

loading

• Aero loading

• Contact/wear

Time Relationship

• Chemical

• Indirect interactions

• Vibration

• Acoustical Direct Effect

• Primary air

• Secondary air

• Control

system

• Structural

dynamics

• Sensor

systems

Categories of LPC/HPC Blade Part Family Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. View in PDF

Categories of Gearbox Housing Assembly Part Family (shafts, gears, housings). Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. View in PDF

Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. View in PDF

Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance. View in PDF

Categories of Major Cases Part Family. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance. View in PDF

Categories of LPT Vane Part Family Repair. Determine which repair description best fit the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance. View in PDF

Source & rights

Document details

Figure A1.2. Part Interaction Considerations

Categories of LPC/HPC Blade Part Family Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

Categories of Gearbox Housing Assembly Part Family (shafts, gears, housings). Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

Categories of LPC-HPC Stator Repair. Determine which repair description best fits the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance.

Categories of Major Cases Part Family. Determine which repair description best fits the repair proposal. If no repair description is appropriate, contact the FAA Advisor for guidance.

Categories of LPT Vane Part Family Repair. Determine which repair description best fit the repair proposal based. If no repair description is appropriate, contact the FAA Advisor for guidance.