Commercial Parts

9/30/10 AC 21-45 part. These articles are acceptable for installation on aircraft under 14 CFR part 43. More detail for owner/operator articles can be found in AC 20-62, Eligibility, Quality, & Identification of Aeronautical Replacement Parts and AC 21-29 for standard parts.

Figure 1. Article Classification

----------71

Ill

Approved

Ill D -......--,- ..., ~ _ -- ..... · ~ Ill

Ill .____--=__=-~----' Ill

Ill - .... ---- .,, = ----==------~~ Ill

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Acceptable

Ill .____-=__~-----=------' Ill

Ill~-------------, Ill

Unapproved

Ill I I ' -~ -, .... , Ill

Ill .____==-----------' Ill

=== === === === === === === === === === _JII

9/30/10 AC 21-45 Table 1 presents a comparison of approved vs. acceptable articles and a comparison of standard vs. commercial.

Table 1. Required Approvals APPROVED ACCEPTABLE ARTICLES CRITERIA ARTICLES STANDARD COMMERCIAL I II I Established Govt. or Industry- Manufacturer’s Design Design Standard DAH or Accepted Spec. (SAE, MIL, etc.) Data Manufacturer’s Design Data Design Approval TC/STC, PMA, TC/STC, PMA, TSOA, LODA TC/STC, PMA TSOA, LODA Production Approval PC, PMA, TSOA Not Required Not Required Note: It is important to note that the article has an approved design under TC, STC, or PMA process. The designation of commercial (or standard) excludes the producer from having to obtain an FAA production approval for the article.

6. How Will DAH Designate Commercial Parts?

a. A DAH who decides to pursue commercial parts under its design approval must determine if its article is eligible. A CPL is generated for each product type (such as Boeing 737) and series/model (-200). For PMA, if the model eligibility lists the S/N, then that information must also be reflected on a CPL. The TC/STC/PMA number is also listed at the top of the CPL. As mentioned in the definition, the commercial part will be listed on a CPL after the DAH shows, and FAA finds: (1) The failure of the article leads to no degradation in the level of safety of the product.

(2) The article is only manufactured under manufacturer’s specifications and marked with the manufacturer’s markings. No additional design, quality, marking, or production receiving inspection is required or performed by the DAH to ensure that failure of the article does not degrade the level of safety of the product.

(3) The article may be subject to further data requirements if the FAA deems it necessary.

b. The DAH will then substantiate/show, and the FAA, in this case project aircraft certification office (PACO), will determine whether the article meets the commercial part definition. A system safety assessment is necessary to show the failure of the article does not degrade safety. Failure is not just its intended function stopping, but also creating a hazard situation. An example is an electrical short not creating a fire hazard. Depending on the nature 9/30/10 AC 21-45 of the commercial part (sink valve vs. cabin reading light bulb), the depth of the system safety assessment can be as simple as providing the airworthiness requirements met when initially approved under type design, or for more complex items perform a system safety assessment as instructed by AC 20-168. If the article is used in multiple locations, and is shown to be commercial part eligible for one location, but not eligible in other locations, then the article is not eligible for commercial part consideration. Once the CPL is approved by the FAA, it is considered to be part of the ICA, and must be provided to an end user in accordance with 14 CFR § 21.50. See figure 2 for a flow chart on the initial commercial parts process.

9/30/10 AC 21-45 Figure 2. Initial CP Process for TC/STC and PMA Holders Flow Diagram DAH decides to designate commercial parts Does failure of article Not a commercial part Yes --~ = - --<. degrade safety of the (END) product?

No Manufactured only No under manu. specs and manu . markings?

Yes Provide specsheet and develop CPL into ICA incorporation plan Send to FAA for approval (PACO) Comply Address shortfalls an Include in ICA No Yes CPL FAA provide substantiating >- -----.i under 14 CFR Approved?

data §21.50 Non-compliance not a commercial part (END) 9/30/10 AC 21-45 7. What a DAH Should Do.

a. Determine if the article is eligible to be considered a commercial part. Use the steps in paragraph 6 and the flowchart in figure 2 to determine eligibility. If it is eligible, develop a CPL for the product. Provide a manufacturer’s specification sheet as a baseline (example of DAH generated specification sheet provided in appendix B, but not all inclusive) and any other information the DAH deems necessary. An example of other information would be if a DVD player needed a metal case instead of a plastic one. If the article uses electrical power, provide a drawing or sketch of where the article is installed (not necessary for non-electrical unless asked for by FAA). Provide the CPL to the FAA and answer questions that arise. Include the CPL in the ICA. It would be helpful to the end user to identify the articles as commercial in the illustrated parts catalog (IPC) or its equivalent and to provide a copy of the latest CPL to entities such as a distributor.

b. In addition, a DAH who has an FAA approved CPL would have to establish a system that: (1) Maintains each list of all commercial parts incorporated into each FAA approved product type, or PMA article as applicable; (2) Furnishes the respective lists (and changes to the lists) to persons in accordance with existing 14 CFR § 21.50; (3) Maintains current commercial parts lists to reflect design changes; and records FAA approval of both the lists and their revisions. Each CPL should have a revision record with each article stating the revision date and level. The list is recommended to be maintained by article number alphanumerically, for ease of use.

8. Preparing the CPL. A CPL is produced for each product type (such as Boeing 737) and series/model. A sample CPL is provided in appendix A. For each article included on the CPL provide the following information: a. Article number (Part Number), b. Article nomenclature, c. Article manufacturer’s name, d. State whether the article uses electrical power, and e. State whether a specification sheet is provided/available (For ease and practicality, specification sheet should be included with the CPL as part of the ICA.

9. Approval of the CPL. Submit the CPL for FAA approval to the PACO. For each article on the CPL, provide the following support data: 9/30/10 AC 21-45 a. State the function of the article, b. Provide system safety assessment, c. Drawing or sketch of where the article is used (articles using electrical power), and d. Dimensions and weight.

Note: Once an article is listed on a CPL and approved, the article may not be removed from the CPL, unless a safety issue exists which involves the article.

10. What to expect from FAA. Through ACs and policy documents, we provide guidance to applicants for commercial parts. The FAA will determine whether a CPL meets all applicable requirements and that all articles on the CPL are commercial parts. A letter, email, or written notification will be sent to the applicant to inform whether the CPL is complete and approved (signed or stamped), rejected with reasoning, or if more data is needed.

11. How to Deal with Repairing, Replacing, and Replacement Alternative Commercial Parts.

a. Repair – Repair in accordance with the DAH’s ICA.

b. Replacement – Replace in accordance with the DAH’s ICA. If multiple manufacturers and article numbers are listed in the CPL for the same article, they are acceptable replacements.

These articles will not have been produced under an FAA-approved production system and therefore will not be accompanied by FAA Form 8130-3, Authorized Release Certificate .

However, the DAH may continue to accompany an 8130-3 under their own production approval if they wish to export the product.

c. Replacement Alternative – A replacement alternative may be necessary due to several factors. The main reasons are article unavailability or obsolescence. Article numbers can change or manufacturers can upgrade models every year. An example is a DVD player. A newer model may come out every year and the older model may no longer be available. An article may also be more cost effective or of a higher quality. Commercial part replacement alternative is an alteration to the aircraft. For the purposes of this AC, the major alteration process will be followed if the article involves electrical power, and will require a record in accordance with 14 CFR § 43.9 with FAA approved data. Otherwise, the replacement alternative follows minor alteration process. Data may be approved by the FAA or an appropriately authorized designated engineering representative (DER). An appropriately authorized DER in this case would be one that has the authority and area of expertise such as an electronics DER to approve only the data for interior electrical equipment.

d. The DER adheres to the same procedures an FAA employee would in making a replacement alternative finding. The DER is allowed to approve the supporting data on behalf of the FAA only for the replacement alternative finding. The DER may not approve any initial 9/30/10 AC 21-45 approvals on the CPL and may not change the CPL. Use FAA Form 8110-3 with the Purpose of Data block filled in as ‘In support of a major alteration for S/N XXXX under 14 CFR § 21.9(a)(4) for a replacement alternative.’ The Applicable Requirements block below the Purpose of Data block should list all the relevant regulations the equipment installation has met, such as 14 CFR § 25.1365. An example is provided in appendix C. The DER should follow all applicable instructions found in FAA Order 8110.37, Designated Engineering Representative (DER) Handbook .

e. If one pursues replacement alternative for a commercial part, follow the flowchart in figure 3 and the following procedures: (1) Review and determine necessary specifications the article must meet.

(2) To qualify for commercial parts replacement alternative, an article with electrical power must meet the requirements of AC 20-168. A DAH provided specification sheet may also be used as long as all the criteria of the specifications are met. If it is a non-electrical article, the article must meet specifications/requirements for the original article.

(3) All replacement alternative articles whether electrical or non-electrical must follow their applicable portions of 14 CFR § 43.9 for the installation and return to service.

9/30/10 AC 21-45 Figure 3. Replacement Alternative Commercial Part Process for Operators and Maintenance Flow Diagram Owner/Operator/ Maintainer decides to use replacement alternative CP s the article being No Not eligible for replaced currently on Replacement Alt.

the CPL?

Yes Yes Does part use electrical power?

No Follow Major Alteration Process Follow Minor Alteration Process Follow AC 20-168 Proper records per Comply with 14 CFR § 43 .9 applicable regs and meet DAH specsheet Data supporting replacement alternative approved by FAA/ DER Proper records per 14 CFR § 43.9 Return to service Form 337 signed by FAA/ Inspector 9/30/10 AC 21-45 12. Related References a. FAA Order 8110.4 - Type Certification.

b. FAA Order 8110.54 – Instructions for Continued Airworthiness Responsibilities, Requirements, and Contents.

c. FAA Order 8110.37 – Designated Engineering Representative (DER) Handbook.

d. FAA AC 21-29 – Detecting and Reporting Suspected Unapproved Parts.

e. FAA AC 20-62 – Eligibility, Quality, & Identification of Aeronautical Replacement Parts.

f. FAA AC 20-168 - Certification Guidance for Installation of Non-Essential, Non- Required Aircraft Cabin Systems & Equipment (CS&E).

g. RTCA, Inc. Document RTCA/DO-313 – Certification Guidance for Installation of Non- Essential, Non-Required Aircraft Cabin Systems & Equipment.

h. FAA Form 8130-3, Authorized Release Certificate (Airworthiness Approval Tag).

i. FAA Form 8110-3, Statement of Compliance with the Federal Aviation Regulations.

~~

FoL David W. Hempe Manager, Aircraft Engineering Division Aircraft Certification Service

10/5/2010 AC 21-45 Appendix A Appendix A. Example of Commercial Parts List STC # ST12345SE COMMERCIAL PARTS LIST Affected Aircraft Type, Boeing Model 737-300 November 18, 2011 Revision #2 Article Article Manufacturer Electrical Specification Number Nomenclature Name Power sheet Yes ABC1 – DIM Light Dimmer ACE Lighting Yes Cabin Reading Light 10203040 Bulb Acme Electronics Yes Yes No 12345678 Curtain Rings Acme Home No Bathroom Door 91827364 Hinge Acme Bath No Yes No 98765432 Sink Valve Acme Kitchen Yes REVISION HISTORY Article Number Revision Date Revision Comment Level 91827364 Article October 21, 2011 (1) 10203040 Added November 18, 2011 (1) (2) Article ABC9876 October 21, 2011 (1) No longer CP Deleted Superseded by A/D #123 Article 12345678 November 18, 2011 (2) Nomenclature changed Changed A-1

10/5/2010 D R A F T AC 21-45

Appendix B

Appendix B. Example of Specification Sheet

ABC Commercial Grade Light Controls Specification Sheet

ACCEPTABLE ACE Lighting Charlie Switches Delta Accessories

MANUFACTURERS

ARTICLE NUMBER ABC1 – DIM XYZ2 – ON DD3 - SLIDE

MATERIAL Plastic Aluminum Plastic

RATING 600W-120VAC 400W-120VAC 600W-120VAC

STANDARDS UL 1472 UL 1472 UL 1472

UL Listed #41307 UL Listed #41307 UL Listed #41307

FCC Part 15 Class B MIL. STD 105 IEC Level 4 Surge

NOM-057 ANSI Z1.4 CSA Certified #LR -

67412

DIMENSIONS As shown in diagram As shown in As shown in

diagram diagram

WEIGHT 1.2 Lbs 0.98 Lbs 1.3 Lbs

Must meet Class Must meet Class Must meet Class

ADDITIONAL

NOTES 1AA insulation 1AA insulation 1AA insulation

requirement requirement requirement

Matching Remote (with LEDs) Dimmer Hot (Blaek) Whilo

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Lina Li no 120VAC , 120VAC , ar277VAC, or 2 nV AC 60H.Z 60Hz

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N ut "' I Noutr.al (W h ita) (White) 1 .75 (44.9)

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10/5/2010 D R A F T AC 21-45 Appendix C Appendix C. Example of FAA Form 8110-3 Statement of Compliance with the Federal Aviation Regulations Used for a Replacement Alternative Approval U.S. DEARTICLEMENT OF TRANSPORTATION DATE FEDERAL AVIATION ADMINISTRATION November 18, 2010 STATEMENT OF COMPLIANCE WITH THE FEDERAL AVIATION REGULATIONS AIRCRAFT OR AIRCRAFT COMPONENT IDENTIFICATION MAKE MODEL NO. TYPE (Airplane, Radio, NAME OF APPLICANT Helicopter, etc.)

ABC (Aircraft ABC 700-300 Aircraft Joe’s Repair Shop Airplane Manufacturer) LIST OF DATA IDENTIFICATION TITLE DEF Co.

BDP-S350 DEF Co. Cook top replaces 123 Cook top XYZ Inc. XYZ Oven replaces 789 Oven LN22A650 - - -END- - - PURPOSE OF DATA In su pp ort of a ma j or alteration for S/N 123 under 14 CFR § 21.9 ( a )( 4 ) for a re p lacement alternative.

APPLICABLE REQUIREMENTS (List specific sections) 14 CFR § 25.1365 (Insert all applicable airworthiness requirements and include amendment level) CERTIFICATION – Under authority vested by direction of the Administrator and in accordance with conditions and limitations of appointment under Article 183 of the Federal Aviation Regulations, data listed above and on attached sheets numbered N/A have been examined in accordance with established procedures and found to comply with applicable requirements of the Federal Aviation Regulations.

I (We) Therefore Recommend approval of these data

D

Approve these data X

D

SIGNATURE(S) OF DESIGNATED ENGINEERING DESIGNATION CLASSIFICATION(S) REPRESENTATIVE(S) NUMBER(S) DERT-999999-NM

Joe Smith

Joe Smith

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