SERVICE BULLETIN SB 61-3806
Beechcraft G58 Baron · Service Bulletins
Overview
This Service Bulletin (SB 61-3806) issued by Raytheon Aircraft Company addresses a mandatory modification for Beechcraft Model 58 and G58 Baron aircraft, specifically serial numbers TH-2097 through TH-2150 with optional propeller unfeathering accumulators installed. The bulletin outlines a critical inspection and modification procedure to prevent chafing between the manifold pressure hose and the propeller accumulator tube assembly, which could lead to engine oil leakage and potential engine failure. Compliance with this bulletin is mandatory prior to further flight for affected aircraft that have not completed an Annual/100-Hour Inspection or the inspection outlined in RAC Safety Communiqué No. 271. The bulletin includes detailed instructions for inspection, modification, and necessary parts, emphasizing the importance of maintaining adequate clearance to avoid chafing and ensuring safety during operation.
- Mandatory compliance for Beechcraft Model 58 and G58 Baron, serials TH-2097 to TH-2150.
- Inspect for chafing between the manifold pressure hose and propeller accumulator tube assembly.
- Modification required prior to further flight if Annual/100-Hour Inspection not completed.
- Estimated man-hours for inspection: 0.7 hours; for tube replacement: 1.0 hour.
- Warranty credit available for compliance, expiring 12 months from issuance.
Document
Source
Originally published by www.bonanza.org. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 2006
- Pages
- 9
- File size
- 1.7 MB
- Publisher
- www.bonanza.org
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In this document
Effectivity
This Service Bulletin applies to Beechcraft Model 58 and G58 Baron aircraft with serial numbers TH-2097 through TH-2150 that have optional propeller unfeathering accumulators installed.
Reason
The bulletin was issued due to reports of engine oil loss and precautionary in-flight shutdown of the left engine caused by chafing between the manifold pressure hose and the propeller accumulator tube assembly. This chafing could lead to engine oil leakage, engine damage, and potential loss of engine power.
Compliance
Compliance with this Service Bulletin is mandatory prior to further flight for affected aircraft that have not completed an Annual/100-Hour Inspection or the inspection outlined in RAC Safety Communiqué No. 271. For those that have completed the inspection, the modification must be accomplished as soon as possible, but no later than the next 50 flight hours or the next scheduled inspection.
Accomplishment Instructions
The Service Bulletin outlines specific steps for inspecting and modifying the manifold pressure hose and its metal identification tags to ensure they do not chafe against the propeller accumulator tube assembly. This includes disconnecting the battery, inspecting for proper routing, and securing the hose to maintain adequate clearance.
Warranty Credit
Warranty credit for labor and parts is available for compliance with this Service Bulletin, but will expire 12 months from the issuance date. All warranty work must be performed by a Raytheon Aircraft Authorized Service Center.
Safety notes
- Loss of engine oil could lead to engine seizure and loss of power.
- Chafing may cause oil leakage, potentially leading to fire or smoke in the engine compartment.
Full document text
1 of 9 SERVICE BULLETIN MANDATORY SB 61-3806 Issued: August, 2006 The export of these commodities, technology or software are subject to the US Export Admin- istration Regulations. Diversion contrary to U.S. law is prohibited. For guidance on export control requirements, contact the Commerce Department’s Bureau of Export Administration at 202-482-4811 or at www.bxa.doc.gov. Raytheon Aircraft Company (RAC) issues Service Information for the benefit of owners and fixed base operators in the form of two classes of Service Bulletins. The first class, Mandatory Service Bulletins (red border) includes changes, inspections and modifications that could affect safety or crashworthiness. RAC also issues Service Bulletins with no red border which are designated as either recommended or optional in the compliance section within the bulletin. In the case of recommended Service Bulletins, RAC feels the changes, modifications, improvements or inspections will benefit the owner/operator and although highly recommended, Recommended Service Bulletins are not considered mandatory at the time of issuance. In the case of Optional Service Bulletins, compliance with the changes, modifications, improvements or inspections is at the owner/operator’s discretion. Both classes are mailed to: (a) RAC Authorized Service Centers. (b) Owners of record on the FAA Aircraft Registration Branch List and the RAC International Owner Notification/Registration Service List. (c) Those having a publications subscription. Information on Owner Notification Service or subscription can be obtained through any RAC Authorized Service Center. As Mandatory Service Bulletins and Service Bulletins are issued, temporary notification in the Service Bulletin Master Index should be made until the index is revised. Warranty will be allowed only when specifically defined in the Service Bulletin and in accordance with the RAC Warranty Policy. Unless otherwise designated, RAC Mandatory Service Bulletins, Service Bulletins and RAC Kits are approved for installation on RAC airplanes in original or RAC modified configurations only. RAC Mandatory Service Bulletins, Service Bulletins and Kits may not be compatible with airplanes modified by STC installations or modifications other than RAC approved kits. Beechcraft 1. Planning Information A. Effectivity (1) Airplanes BEECHCRAFT Model 58 and G58 Baron, Serials TH-2097 through TH-2150 with optional propeller unfeathering accumulators installed. If you are no longer in possession of the airplane, please forward this information to the present owner. (2) Spares None. B. Reason This Service Bulletin is being issued to correct a condition in which potential for chafing exists between lines, hoses, electrical wires, structure and components. Raytheon Aircraft Company (RAC) received a report of the loss of engine oil and subsequent precautionary in-flight shutdown of the left engine resulting from chafing between the metal identification tags on the flexible manifold pressure hose and the P/N 96- 960011-23 propeller accumulator tube assembly. In the incident case, chafing of the propeller accumulator tube assembly with the manifold pressure hose’s metal identification tags resulted in a hole in the propeller accumulator tube assembly and leakage of engine oil into the left engine compartment. The propeller accumulator tube assembly supplies oil pressure to a feathered propeller to facilitate in-flight unfeathering of the propeller. If this tube is chafed to the extent that oil under pressure is released, the loss of engine oil could cause oil starvation engine damage, loss of engine power, and engine seizure. Engine seizure due to loss of engine oil may lead to inability to feather the propeller. Additionally, the loss of engine oil could affect the unfeathering of the propeller. Loss of engine power and/or inability to control the propeller feathering may adversely affect airplane controllability. Engine oil leaking into the engine compartment may come into contact with the exhaust system, electrical wiring, and other components possibly leading to fire or smoke. Fire or smoke may adversely affect airplane controllability, or lead to pilot incapacitation. Adequate clearance between all lines, hoses, electrical wires, structure and components must be maintained to avoid chafing. RAC issued Safety Communique No. 271 concerning this condition. TITLE: PROPELLERS - LEFT ENGINE PROPELLER UNFEATHERING ACCUMULATOR OIL TUBE ASSEMBLY CHAFING INSPECTION AND MODIFICATION MANDATORY SERVICE BULLETIN Issued: August, 2006 SB 61-3806 2 of 9 C. Description This Service Bulletin inspects the manifold pressure hose and its metal identification tags for proper routing and adequate clearance to avoid a potential chafing condition with the propeller accumulator tube assembly. Both the manifold pressure hose and it’s metal identification tags are positioned and secured to avoid contact with other lines, hoses, electrical wires, structure and components. D. Compliance An Airworthiness Directive will be requested on the matter covered by this Service Bulletin. Raytheon Aircraft Company considers this to be a mandatory modification and it must be accomplished prior to further flight for affected aircraft that have not completed an Annual/100-Hour Inspection as outlined in the current BEECHCRAFT Baron 55 and 58 Shop Manual (P/N 55-590000-13E25 or subsequent) or that have not completed the inspection outlined in RAC Safety Communiqué No. 271. For aircraft that have completed an Annual/100-Hour Inspection as outlined in the current BEECHCRAFT Baron 55 and 58 Shop Manual or that have completed the inspection outlined in RAC Safety Communiqué No. 271, this modification must be accomplished as soon as possible after receipt of this Service Bulletin, but no later than the next 50 flight hours or next scheduled inspection, whichever occurs first. E. Approval The engineering data contained in this Service Bulletin is FAA approved.
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F. Manpower The following information is for planning purposes only: Estimated man-hours for inspection and installation of clamps: 0.7 hours. Estimated man-hours to replace propeller accumulator tube assembly, if required: 1.0 hour. Suggested number of men: 1 man. The above is an estimate based on experienced, properly equipped personnel complying with this Service Bulletin. Occasionally, after work has started, conditions may be found which could result in additional man-hours. G. Weight and Balance Negligible. H. Electrical Load Data Not changed. I. Software Accomplishment Summary Not applicable. J. References Raytheon Aircraft Safety Communique No. 271; Raytheon Aircraft Company, BEECHCRAFT Baron 55 and 58 Shop Manual, P/N 55-590000-13E25 or subsequent revision, Sections 1, 2 and 16 (Pages 5 and 6, Items B.3, B.22, and B.23). SERVICE BULLETIN Issued: August, 2006 3 of 9 MANDATORY SB 61-3806 K. Publications Affected It is recommended that a note “See Service Bulletin No. 61-3806” be made in the following: Raytheon Aircraft Company, BEECHCRAFT Baron 55 and 58 Shop Manual, P/N 55-590000-13E25 or subsequent revision, 100-Hour Inspection Guide, Section 16. L. Interchangeability of Parts Not applicable. M. Warranty Credit Warranty credit for labor and parts to the extent noted under MANPOWER and MATERIAL will be allowed on all affected airplanes. Warranty coverage offered in this Service Bulletin will expire 12 months from the last day of the month this Service Bulletin is issued. After that date, the owner/operator assumes the responsibility for compliance cost. Raytheon Aircraft Company reserves the right to void warranty coverage in the area affected by this Service Bulletin until the date the Service Bulletin is accomplished by a Raytheon Aircraft Company Authorized Service Center. All warranty work must be accomplished by a Raytheon Aircraft Authorized Service Center rated to perform maintenance on the specific model of Beechcraft Airplane. All warranty reimbursements are handled through Raytheon Aircraft Company Authorized Service Centers. The owner/operator should arrange for an Authorized Service Center to perform the work and the Authorized Service Center must submit the standard Raytheon Aircraft Company warranty claim. 2. Material Information A. Materials - Price and Availability Contact a Raytheon Aircraft Authorized Service Center for information. B. Industry Support Not applicable. C. Airplanes The following parts required for this modification may be ordered through a Raytheon Aircraft Authorized Service Center or RAPID: Part Number Description Quantity Per Airplane 96-960011-23 * Tube Assembly, Propeller Accumulator, LH As Required * Part number of Raytheon Aircraft Company, P. O. Box 85, Wichita, KS 67201-0085. Obtain from Raytheon Aircraft Parts Inventory and Distribution Company (RAPID), 10511 E. Central, Wichita, KS 67206, Website: raytheonaircraft.com, E-mail: parts@raytheonaircraft.com, 1-888-RAPID44 (1-888- 727-4344) (Domestic) or 316-676-3100 (International), FAX: 316-676-3222 (Domestic) or 316-676- 3327 (International). MANDATORY SERVICE BULLETIN Issued: August, 2006 SB 61-3806 4 of 9 The following parts and materials, or their equivalent, may be obtained locally: D. Spares Not applicable. E. Reidentified Parts None. Part Number Description Quantity Per Airplane MS21919WDG8 Clamp, Loop Type, Cushioned, Support - 1/2 Inch (Manifold Pressure Hose) As Required MS21919WDG10 Clamp, Loop Type, Cushioned, Support - 5/8 Inch (Engine Mount Assembly) As Required AN3-4A (NASM3-4A) or 130909B14 *** Bolt - Machine, Aircraft (Clamp Hardware) As Required AN960-10 (NAS1149F0363P) Washer, Flat (Clamp Hardware) As Required MS21042-3 (NASM21042-3) Nut, Self-Locking, Ring Base (Clamp Hardware) As Required TT-N-95, Type II Solvent, Aliphatic Naphtha * As Required Solvent, Methyl Propyl Ketone (MPK) * As Required ASTM D329 Solvent, Acetone * As Required TT-I-735A Solvent, Isopropyl Alcohol * As Required DOD-R-003081 Rag, Lint-Free As Required CCC-C-440 or A-A-1491 Cheesecloth, Cotton As Required A-A-53513 or P/N 187 7711 ** Gloves, Polyethylene, Industrial, Solvent Handling As Required * Obtain from Barton Solvents, Inc., 201 South Cedar, P. O. Box 366, Valley Center, KS 67147, Website: www.barsol.com, 316-755-2305, FAX: 316-755-2323; or Eastman Chemical Company, Inc., P. O. Box 431, 100 North Eastman Road, Kingsport, TN 37662, Website: www.eastman.com, 1- 800-EASTMAN (1-800-327-8626) or 423-229-2000, FAX: 423-229-2145. ** Part number of Eastman Kodak Company, 343 State Street, Rochester, NY 14650, Website: www.kodak.com, 1-800-242-2424 or 716-724-4000. *** Part number of Raytheon Aircraft Company, P. O. Box 85, Wichita, KS 67201-0085. Obtain from Raytheon Aircraft Parts Inventory and Distribution Company (RAPID), 10511 E. Central, Wichita, KS 67206, Website: raytheonaircraft.com, E-mail: parts@raytheonaircraft.com, 1-888-RAPID44 (1-888- 727-4344) (Domestic) or 316-676-3100 (International), FAX: 316-676-3222 (Domestic) or 316-676- 3327 (International). SERVICE BULLETIN Issued: August, 2006 5 of 9 MANDATORY SB 61-3806 F. Tooling - Price and Availability Not applicable. 3. Accomplishment Instructions This Service Bulletin shall be accomplished as follows: NOTE Should any difficulty be encountered in accomplishing this Service Bulletin, contact Raytheon Aircraft Company at 1-800-429-5372 or 316-676-3140. A. Airplane Observe all Warnings and Cautions contained in the aircraft manuals referenced in this Service Bulletin. Whenever any part of this system is dismantled, adjusted, repaired or renewed, detailed investigation must be made on completion to make sure that distortion, tools, rags or any other loose articles or foreign matter that could impede the free movement and safe operation of the system are not present, and that the systems and installations in the work area are clean. (1) Remove all power from the airplane and disconnect the battery. Display warning notices prohibiting reconnection of airplane electrical power. Refer to Section 2 of the BEECHCRAFT Baron 55 and 58 Shop Manual. NOTE Prior to performing the inspection, clean the area (as needed) free of dirt, grease and grime using an appropriate solvent and a clean cotton cheesecloth or lint-free rag. Wipe the surface dry with a clean cotton cheesecloth or lint-free rag. Repeat cleaning procedures, as necessary, until obtaining a clean surface. (2) Inspect the engine manifold pressure hose and its metal identification tags for proper routing and adequate clearance to avoid any chafing with the propeller accumulator tube assembly. Refer to Figure 1. If the propeller accumulator oil tube assembly is replaced, it must be inspected along its entire length to ensure clearance between it and all tubes, hoses, electrical wires, parts, components, and structure to avoid chafing. (3) Inspect the propeller accumulator oil tube assembly for chafing damage, paying particular attention to the area identified in Figure 1. If any chafing damage is present, the tube must be replaced before further flight. Reference Section 1 of the BEECHCRAFT Baron 55/58 Shop Manual for torque of applicable fittings. MANDATORY SERVICE BULLETIN Issued: August, 2006 SB 61-3806 6 of 9 Adequate clearance between all tubes, hoses, electrical wires, parts, components and structure must be maintained to avoid chafing. Refer to Items B.3, B.22, and B.23 of the 100-Hour Inspection Guide in the BEECHCRAFT Baron 55 and 58 Shop Manual (Section 16, Pages 5 and 6). (4) Position (relocate) and secure both the manifold pressure hose and its metal identification tags to avoid contact with other tubes, hoses, electrical wires, parts, components and structure. Refer to Figures 2 and 3 and proceed as follows: (a) Disconnect the manifold pressure hose at the firewall fitting and route it above the wire bundle and air conditioning hose. Refer to Figures 2 and 3. (b) Reconnect the manifold pressure hose at the firewall fitting. Reference Section 1 of the BEECHCRAFT Baron 55/58 Shop Manual for torque of applicable fittings. (c) Attach an MS21919WDG8 clamp to the manifold pressure hose (1/2 inch) and an MS21919WDG10 clamp to the engine mount assembly (5/8 inch). Position clamp on engine mount to achieve maximum clearance with surrounding components and structure. Secure the manifold pressure hose to the engine mount assembly as shown in Figures 2 and 3. Secure the clamps together with an AN3-4A (NASM3-4A) bolt, AN960-10 (NAS1149F0363P) washer, and an MS21042-3 (NASM21042-3) self-locking nut. (5) Reconnect the airplane battery, remove warning notices and restore power. Refer to Section 2 of the BEECHCRAFT Baron 55 and 58 Shop Manual. (6) Ensure all work areas are clean and clear of tools and miscellaneous items of equipment. (7) Make an appropriate maintenance record entry. (8) Return airplane to service. B. Spares Not applicable. C. Record of Compliance Upon completion of this Service Bulletin, make an appropriate maintenance record entry. SERVICE BULLETIN Issued: August, 2006 7 of 9 MANDATORY SB 61-3806 VIEW OF LEFT ENGINE FIREWALL FORWARD FACE SHOWING PREVIOUS HOSE ROUTING (LOOKING OUTBOARD) Figure 1 MANDATORY SERVICE BULLETIN Issued: August, 2006 SB 61-3806 8 of 9 VIEW OF LEFT ENGINE FIREWALL FORWARD FACE SHOWING NEW HOSE ROUTING (LOOKING OUTBOARD) Figure 2 SERVICE BULLETIN Issued: August, 2006 9 of 9 MANDATORY SB 61-3806 VIEWS OF LEFT ENGINE FIREWALL FORWARD FACE SHOWING NEW HOSE ROUTING (LOOKING OUTBOARD) Figure 3