Transcription

1 Page 1 of 14 Subject: ELIGIBILITY, QUALITY, AND IDENTIFICATION OF AERONAUTICAL REPLACEMENT PARTS Date: / /95 (DRAFT) AC No: 20-62D Initiated by: AFS-340 Change: DRAFT 1. PURPOSE. This advisory circular (AC) is intended to provide information and guidance for use in the determination of quality, eligibility and traceability of aeronautical parts and materials intended for installation on type-certificated products. This information provides guidance to enable compliance with applicable regulations. 2. CANCELLATION. AC 20-62C, Eligibility, Quality, and Identification of Approved Aeronautical Replacement Parts, dated August 26, 1976, is cancelled. 3. DISCUSSION. The Federal Aviation Administration (FAA) continues to receive reports of replacement parts being offered for sale as aircraft quality when the quality and where the origin of the parts are unknown or questionable. Such parts may be advertised or presented as "unused," "like new," or "remanufactured." These imply that the quality of the parts is equal to an acceptable part. Purchasers of these parts may not be aware of the potential hazards involved with replacement parts for which acceptability for installation on a type-certificated product has not been established. The performance rules for replacement of parts and materials used in the maintenance, preventive maintenance, and alteration of aircraft that have (or have had) a U.S. airworthiness certificate, and components thereof, are specified in Sections and of Title 14 of the Code of Federal Regulations, commonly referred to as the "Federal Aviation Regulations (FAR)." Those rules require that the installer of a part use methods, techniques, and practices acceptable to the FAA, and that the installer of a part do that work in such a manner and use materials of such quality, that the product or appliance worked on will be at least equal to its original or properly altered condition with respect to the qualities affecting airworthiness. The continued airworthiness of aircraft, which includes the replacement of parts, is the responsibility of the owner/operator, as specified in FAR Sections , , , , and Those rules require that the installer determine that a part is acceptable for installation on a product or component prior to returning that product or component to service with the part installed. Those rules also require that the installation of a part must be accomplished in accordance with (IAW) data approved by the FAA, if the installation constitutes a major repair or alteration. As part of determining whether installation of a part conforms with all applicable regulations, the installer can establish that

2 Page 2 of 14 the part was manufactured under a production approval pursuant to FAR Part 21, that an originally acceptable part has been maintained IAW FAR Part 43, or that the part is otherwise acceptable for installation, e.g., has been found to conform to data approved by the FAA. This AC addresses means to help the installer make the required determinations. 4. RELATED FAR SECTIONS. a. FAR Part 1, Definitions and Abbreviations. b. FAR Part 21, Certification Procedures for Products and Parts c. FAR Part 39, Airworthiness Directives d. FAR Part 43, Maintenance, Preventative Maintenance, Rebuilding, and Alteration. e. FAR Part 45, Identification and Registration Marking. f. FAR Part 91, General Operating and Flight Rules g. FAR Part 121, Certification and Operations: Domestic, Flag and Supplemental Air Carriers and Commercial Operators of Large Aircraft. h. FAR Part 125, Certification and Operation: Airplanes having a seating capacity of 20 or more passengers or a maximum payload capacity of 6,000 pounds or more. i. FAR Part 127, Certification and Operations of Scheduled Air Carriers with Helicopters. j. FAR Part 135, Air Taxi Operators and Commercial Operators. 5. RELATED READING MATERIAL. a. FAA Documents: (1) AC 21-29, latest revision, Detecting and Reporting Suspected Unapproved Parts. (2) AC 21-38, latest revision, Disposition of Salvageable Aircraft Parts and Material. (3) AC 43-9, latest revision, Maintenance Records. (4) AC 21-2, latest revision, Export Airworthiness Approval Procedures (5) AC 21-13, latest revision, Standard Airworthiness Certification of Surplus Military Aircraft and Aircraft Built from Spare and Surplus Parts. (6) AC , latest revision, Acceptable Methods, Techniques and Practices--Aircraft Inspection and Repair. (7) AC 21-20, latest revision, Supplier Surveillance Procedures (8) AC 21-18, latest revision, Bilateral Airworthiness

3 Page 3 of 14 Agreements. (9) FAA Order , latest revision, Procedures For Completion Of FAA Form Airworthiness Approval Tag. (10) FAA Order , Suspected Unapproved Part Program. 6. DEFINITIONS. The following definitions apply to this AC: a. FAA Approved Parts. Under FAR Section , parts, which were produced under an FAA-approved production system and conforms with FAA-approved Data, may be approved: (1) Under a Parts Manufacturer Approval (PMA) issued under FAR Section (2) Under a Technical Standard Order Authorization (TSOA) issued by the Administrator. (3) In conjunction with type certification procedures for a product. (4) In any manner approved by the Administrator, such as FAR Part 21, Subparts F and G, parts produced under a production certificate. In addition, Subpart N provides for the acceptance of a part produced in a country with which the United States has an agreement for the acceptance of parts for export and import; the part is approved when the country of manufacture issues a certificate of airworthiness for export for the part. b. Acceptable Parts. The following parts may be found to be acceptable for installation on a type-certificated product: (1) Standard parts (such as nuts and bolts) conforming to an established industry or U.S. specification. (2) Parts produced by an owner or operator for maintaining or altering his or her own product. (3) Parts for which inspection and tests have been accomplished by properly authorized persons to determine that the part conforms to FAA-approved design data. c. Class I Product. A complete aircraft, aircraft engine, or propeller that has been type-certificated IAW applicable FAR, and for which Federal Aviation Specifications have been issued. d. Class II Product. A major component of a Class I product (i.e., wings, fuselages, empennage assemblies, landing gears, power transmissions, or control surfaces), the failure of which would jeopardize the safety of a Class I product; or any part, material, or appliance, approved and manufactured under the Technical Standard Order (TSO) system in the "C" series. e. Class III Product. Any part or component that is not a Class I or Class II product and that includes standard parts (such as those designated in Army/Navy (AN), National Aerospace Standards (NAS); or the Society of Automotive Engineers (SAE); reference FAR Section ). Class III products are considered to be parts. f. Standard Parts. Parts (such as nuts and bolts) conforming to

4 Page 4 of 14 an established industry or U.S. specifications. NOTE: Manufacturers of standard parts are not all certificated by the FAA and, therefore, may not be subject to FAR requirements and surveillance. The manufacturer of a standard part may produce a document stating that the part conforms to an established industry standard or U.S. specifications. g. New. A product, accessory, part, or material that has no operating time or cycles. NOTE: There could be time/cycles on a new type-certificated product due to a manufacturer's test cell or certification requirements. h. Surplus. Describes a product, assembly part, or material that has been released as surplus by the military, manufacturers, owners/operators, repair facilities, or any other parts supplier. These products should be accompanied by the manufacturer's, air carrier's, or FAA repair station's material certification at the time of sale. i. Overhauled. Describes an airframe, aircraft engine, propeller, appliance, or component part that has undergone the following, using methods, techniques, and practices acceptable to the Administrator: (1) it has been disassembled, cleaned, inspected, repaired as necessary, and reassembled and (2) it has been tested with IAW approved standards and technical data, or current standards and technical data acceptable to the Administrator, which have been developed and documented by the holder of a; (a) Type Certificate (TC) (b) Supplemental Type Certificate (STC), or material, part, process, or appliance approval under FAR Section j. Rebuilt. Describes an aircraft, airframe, aircraft engine, propeller, appliance, or component part that has undergone the following, using new parts or used parts that conform to new part tolerances and limits or to approved oversized or undersized dimensions: (1) it has been disassembled, cleaned, inspected, repaired as necessary, and reassembled; and (2) it has been tested to the same tolerances and limits as a new item. k. Required Inspection Records. The person approving or disapproving for return to service a type-certificated product or appliance or component part thereof must include the following information: (1) type of inspection and a brief description of the extent of the inspection (2) date of the inspection

5 Page 5 of 14 (3) aircraft total time in service (4) signature, certificate number, and kind of certificate held by the person approving or disapproving for return to service and (5) if the product is approved or not approved for return to service, and the appropriate certifying statement l. Altered. Describes a type-certificated product for which a major change in type design is introduced that is not great enough to require an application for a new TC. m. As Is. Describes any airframe, aircraft engine, propeller, appliance, component part, or material, the condition of which is unknown. n. Appropriately Certificated Person. As related to return to service after maintenance, preventative maintenance, rebuilding, or alteration, can include the holder of a: (1) mechanic certificate (2) inspection authorization (3) repair station certificate (4) air carrier operating certificate under FAR Part 121, 127, or 135 (5) private pilot certificate (for performing preventative maintenance), or (6) manufacturer's maintenance facility. (7) It can also include an appropriately authorized individual employed by the holder of a repair station or air carrier certificate. o. Owner/Operator Produced Part. An owner is considered a producer of a part, if the owner participated in controlling the design, manufacture, or quality of the part. Participating in the design of the part can include, supervising the manufacture of the part or providing the manufacture with the following: the design data, the materials with which to make the part, the fabrication processes, assembly methods, or the quality control procedures. When dealing with a contracted manufacturer or non-certificated persons, the manufacturer or non-certificated person is also considered a "producer" of the part. 7. IDENTIFICATION OF REPLACEMENT PARTS. Acceptable replacement parts should be identified using one of the following methods: a. Airworthiness Approval Tag. The approval tag, FAA Form , Airworthiness Approval/Conformity Certification Tag (Class III Products for Export Purposes and for Recording the Conformity Status of Prototype Articles), identifies a part or group of parts, that have been approved for export as required under FAR Part 21, Subpart L. b. Joint Aviation Authority (JAA) Tag, JAA Form One. The JAA Form One is the form used by an authority to identify new parts that are imported into the U.S. from countries within the

6 Page 6 of 14 European community that are members of the JAA. Other Civil Aviation Authorities (CAA) have incorporated similar forms, that are acceptable to the FAA, when approved under a Bilateral Airworthiness Agreement (BAA). It should be noted that authorization tags are currently restricted to new parts. The use of an authorization tag does not approve the installation of a part on a type-certificated product. Additional substantiated authorization for compliance with FAR Part 43 and the FAA-approved data for major repairs and alterations is required for installation on a type-certificated product. c. FAA TSO Marking and Privileges. TSOA is issued under FAR Section , Subpart O. A TSOA article should be permanently and legibly marked with the name, address of the manufacturer, type, part number or model designation of the article; the serial number or date of manufacture of the article or both; and the applicable TSO number. d. FAA-PMA Symbol. An FAA-PMA is issued under FAR Section Each PMA part should be marked with the letters, "FAA-PMA," IAW FAR Section 45.15; the name, trademark, or symbol of the holder of the PMA, part number, and name and model designation of each certificated product, on which the part is eligible for installation. Parts that are too small or otherwise impractical to be marked may, as an alternative, be marked showing the above information on an attached tag or labeled container. If the marking on the tag is too extensive to be practical, the tag attached to a part or container may refer to a readily available manual or catalog for part eligibility information. Under a licensing agreement, when the applicant has been given the right to use the TC holder's design, which includes the part number, and a replacement part is produced under that agreement, the part number may be identical to that of the TC holder, provided that the PMA holder includes the letters, "FAA-PMA," and the PMA holder's identification symbol is on the part. In all other cases, the PMA holder's part number must be different from that of the TC holder. e. Shipping Ticket, Invoice, or Other Documents. These documents may provide evidence that a part was produced by a manufacturer holding a: (1) TC - issued as normal, utility, acrobatic, commuter, transport, primary, restricted, surplus aircraft, aircraft engine, and propellers, are specifications to establish a level of safety. (2) Production Approval Certificates - is issued to a production facility for the production of a particular design of aircraft, engine, or propeller and replacement parts thereof. Production Certificates (PC) include PC, TSOA, Approved Production Inspection Systems (APIS), and Part Manufacture's Approval (PMA). (3) TSOA - is issued to a manufacturer for a specific product produced to a minimum performance standard in a Technical Standard Order. f. Foreign Certificate of Airworthiness for Export. Numerous documents that are similar in format to the JAA Form One, are being used by countries that have BAA's with the United States. The JAA Form One is used by members of the JAA. Similar documents that contain information used by other countries, may also be

7 Page 7 of 14 found acceptable, provided that they meet the requirements of FAR Section g. Direct Ship Authority. In order for "direct ship" parts to be recognized as produced under a manufacturer's FAA production approval, the manufacturer must specifically authorize the shipping supplier, in writing, and must establish procedures that ensure that the shipped parts conform to the approved design and are in condition for safe operation. A statement to the supplier from the certificate holder authorizing direct shipment, and date of authorization, should be included on the shipping ticket, invoice, or other transfer document. It should contain a declaration that the individual part was produced under the "production number" of a production approval holder (PAH). The shipping document should also identify the production approval holder's number. h. Maintenance Release Document. A release, signed by an appropriately certificated person, qualified for the relevant function that signifies that the item has been returned to service, after a maintenance or test function has been completed. This type of documentation could be in the form of a repair station tag, containing adequate information (FAR Section 43.9), work order, FAA Form 337, FAA Form , or a maintenance record entry, which must include an appropriate description for maintenance work performed; including the recording requirements of FAR Section 43.9, and Appendix B of Part 43. NOTE: Non-Certificated Distributor's Certification. When a distributor certifies that it is shipping the correct part ordered, the only thing the distributor is certifying is that the part number agrees with the purchase order, not the status of FAA acceptability of the part. 8. INFORMATION RELEVANT TO USED PARTS. The following information may be useful when assessing maintenance records and part status. a. Documentation. If the part has been rebuilt, overhauled, inspected, modified, or repaired; the records should include a maintenance release, return-to-service tag, repaired parts tag, or similar documentation from an FAA-certificated agency. Documentation describing the maintenance performed and parts replaced, must be made for the part. (Reference FAR Section 43.9 and Appendix B of Part 43.) b. Information that should be obtained. The records should include information, either directly or by reference, to support documentation that may be helpful to the user or installer in making a final determination, as to the airworthiness and eligibility of the part. Listed are examples of information that should be obtained. (1) Airworthiness Directives (AD) status (2) Compliance or noncompliance with service bulletins (3) Life/cycle limited parts status (i.e., total time, time since overhaul (TSOH), cycles, history) should be substantiated. If the part is serialized and life-limited, then both operational time or cycles (where applicable) must be indicated. Historical records that clearly establish and substantiate time and cycles must be provided as evidence.

8 Page 8 of 14 (4) Shelf life data, including manufacturing date or cure date (5) Approved date for repaired items (6) Shortages applicable to assemblies or kits (7) Import or export certification documents (8) The operator's name and the reasons for part removal (9) The TSOA if known (10) Zero time, if the part has not been used c. Unusual Circumstances. If a particular part was obtained from any of the following, then it should be so identified by some type of documentation, (i.e., maintenance record entries, removal entries, overhaul records). (1) Non-certificated aircraft (for example, public use, non U.S., and military surplus aircraft). (2) Aircraft, aircraft engines, propellers or appliances; subjected to extreme stress or heat, major failure, accident, or fire. (3) Salvaged aircraft or aircraft components d. Seller's Designation. The seller may be in a position to provide documentation that indicates relevant, detailed information, that describes: (1) Part produced under FAA Production Approval, by TC, PC, PMA, TSOA, or APIS holder; (2) Part produced by a foreign manufacturer (IAW FAR Part 21, Subpart L); (3) Standard part produced by a named manufacturer; (4) Part distributed by a PAH's authorized distributor; (5) Part produced by a repair station to accomplish a repair or alteration on a specific ("in-house") type-certificated product, e.g., to accomplish an STC alteration; and (6) Part produced by an owner or operator for installation on the owner's or operator's aircraft, e.g., by a certificated air carrier. e. Manufacturer The manufacturer of the part may be identified; if not identified it may be difficult to proved that the part is acceptable for installation on a type-certificated product. f. Certificates and Approvals Held. (1) Manufacturers - The certificate or approval held by the manufacturer, TC, PC, TSOA, PAH, or PMA may be listed; if not known, state as unknown. (2) Air Agencies - The certificate held by the Air Agencies; FAR Part 145 may be listed, if not known, state as unknown.

9 Page 9 of 14 (3) Air Operator - The certificate held by Air Operators, FAR Parts 121, 127, and 135. g. Part Description. Indicate the part's physical description for positive identification. h. Part Number. Document the manufacturer's part number or, if the part has been modified, the amended part number. i. Serial Number. Document the specific part's serial number, if so marked. Determine if serialized part has any life or overhaul limitations. 9. CIVIL MANUFACTURED SURPLUS. Many materials, parts, appliances, and components released as surplus by the manufacturers, from obsolete or overstocked items, have entered into the civil aviation community. The installer of a part must establish that installation of a part will enable the product or component on which it is installed to continue to comply with the applicable airworthiness regulations. In this context, the installer of a surplus part must not only establish that the design of the part is acceptable, but also that the surplus part does, indeed, conform to that design. 10. CONDITION FOR SAFE OPERATION. Parts and materials should be properly stored, protected, or operated to assure airworthiness. a. Composite Materials. Generally, most composite materials (thermoset polymers) have a refrigeration shelf life recommended by the manufacturer. Composite materials must be kept refrigerated IAW the manufacturer's recommended temperature range and out-of-refrigeration time (out-time) limitations. Records must be maintained of the cumulative total of material out-time to prevent exceeding shelf life. b. Anti-friction Bearings. Anti-friction bearings that have been in storage for a long period of time, even though encased in a protective coating or within a component, are subject to deteriorating effects of time and the elements. Such parts should be completely inspected and lubricated before being placed in service. c. Aircraft Fabric. Fabric and prefabricated covers should be used only if they are identifiable as meeting aircraft standards. All fabric should be examined and tested for freedom from deterioration, due to age, environmental condition, and contamination. d. Dope, Paint, Sealants, and Adhesives. These items advertised as aircraft quality may have deteriorated due to age or environmental conditions, while in storage, and should be tested before use. e. Parts with Internal Seals. Internal seals on parts such as pumps, valves, actuators, motors, generators, and alternators are subject to deterioration from long-term storage and are susceptible to early failure in service. A procedure should be established for control of shelf life items in order to prevent possible premature failures of the parts/components. f. Rotating Components. Rotating components such as surplus

10 Page 10 of 14 propellers and rotor blades may have a life limit or retirement life. Maintenance records should reflect a complete continuity of service time and repair history. Information that indicates whether the component has exceeded the life limit may, in some cases, be obtained from the manufacturer or from an FAA-approved repair station that may have affixed a logo, decal, or some other identification. g. Heat and Fire. Parts that may have been exposed to heat or fire can be seriously affected and are likely unserviceable. h. Corrosive. Foreign or corrosive liquids can also be detrimental on aircraft parts. Parts, appliances, and components that have been submerged in salt water may be unserviceable parts. i. Manufacturing Rejects. Parts that failed the manufacturers quality assurance inspection criteria for conformity to type design, are often offered for sale by the manufacturers as scrap without being mutilated or destroyed rendering them unusable, are unacceptable for installation. j. Damaged Aircraft. Parts removed from an aircraft involved in an accident may have been subjected to undue stresses that may have seriously effected structural integrity and rendered them permanently unusable. k. Rebuilt Engines. Only engines that are rebuilt by a manufacturer holding an FAA production approval, or an agency approved by the PAH can be considered as zero-timed (reference FAR Section ) 11. ELECTRICAL PARTS AND INSTRUMENTS. a. Electronic Kits. Assembled by non-certificated individuals are not eligible for installation on type-certificated aircraft, until the part is certified as airworthy and found eligible for installation, IAW FAR Part 43. During and after assembly, these kits should receive documented conformity inspections, by properly certificated persons, to ensure that they meet all applicable airworthiness requirements, for use on the specific aircraft on which they are to be installed. The installation of these approved units should be accomplished by or under the supervision of a properly certificated person or agency IAW FAR Part 43. When the installation is a major alteration, the kit data and the data used for the alteration of the product must be approved by the FAA. A properly certificated person must complete the maintenance records to ensure that the aircraft is approved and airworthy for return to service. b. Avionics Parts. Small avionics replacement parts and assemblies (such as resisters, capacitors, diodes, and transistors) should be the part number identified in the manufacturers parts manual and should be tested to determine if they meet the manufacturer's performance specifications. In the absence of a specific part number, installation of a replacement part must enable the device in/on which it is installed to perform at a level at least equal to that of the approved device. c. Aircraft Instruments. Instruments advertised as "high quality," "looks good," or "remanufactured" should not be put in service unless they are inspected, tested, and/or overhauled as necessary, by an appropriately rated FAA-certificated repair

11 Page 11 of 14 station, and the installer establishes that the aircraft in which the instrument is installed will comply with the applicable regulations. Instruments are highly susceptible to hidden damage caused by rough handling or improper storage conditions. Therefore, instruments that have been sitting on a shelf more than 1 year or have been on a shelf for a period that can not be established, should be tested (at a minimum) by an appropriately rated FAA-certificated person. d. Discrete Electronic Components. Because of the proliferation of large scale integrated circuits, multi layer circuit boards, surface mount technology, and other advanced applications; a repair facility may ultimately have to replace defective discrete components in units under repair. This advance of new technology in integrated avionics and instruments, has developed a gap in the procurement of discrete components to repair older units. If the unit manufacturer's approved parts list designates a specific or generic component, that specific component should be obtained from the manufacturer or the supplier producing under the manufacturer's production approval. 12. KNOW YOUR SUPPLIERS. a. Suspected Unapproved Parts (SUP). A SUP is a part, component, or material that may not be approved or acceptable, as described in paragraph 6. Some appear to be as good as the part manufactured from an FAA-approved source. However, there may be manufacturing processes that, if not performed by the unauthorized source, would not be readily apparent to the purchaser (for example, heat treating, plating, or various tests and inspections). Often, a substandard, unapproved part is not discovered until a malfunction or an accident/incident occurs. Whenever a SUP is discovered by anyone in the civil aviation community, that person should notify the FAA's System Surveillance and Analysis Division, AIR-300, IAW AC 21-29, Detecting and Reporting Suspected Unapproved Parts. That person should inform AIR-300 by using FAA Form , Suspected Unapproved Parts Notification, or by calling the toll free FAA Aviation Safety Hotline at b. Used and Repaired Parts. In addition to unapproved parts, used or repaired parts may be offered for sale as "like new," "near new," and "remanufactured." Such terms do not aid the purchaser in positively determining that the part is acceptable for installation on a type-certificated product, IAW applicable airworthiness requirements. c. Caution. Beware of a good deal! Most aircraft parts distributors, aircraft supply companies, and aircraft electronic parts distributors are not subject to certification or surveillance by the FAA. They are not required to certify the airworthiness of parts they advertise and/or sell. 14. SUMMARY. The approval for return to service after maintenance of aircraft, engines, propellers, appliances, and materials and parts thereof is the responsibility of the person who performs the maintenance and who signs the record for approval for return to service. The owner/operator (as noted in paragraph 3, DISCUSSION, of this AC) is responsible for the continued airworthiness of the aircraft. To ensure continued safety in civil aviation, it is essential that appropriate data is used when inspecting, testing, and determining the acceptability of all parts and materials. Particular caution

12 Page 12 of 14 should be exercised when the identity of parts, materials, and appliances cannot be established or when their origin is in doubt. Appendices 1 and 2 provide a sample format that can be used by members of the aviation community to develop their own forms, for the purchase or sale of aeronautical replacement parts, that are to be used on FAA type-certificated aircraft. The format is based on the guidelines contained in this AC. Thomas C. Accardi Director, Flight Standards Service Appendix 1 Part or Material Information (Sample Format) 1. Seller's name 2. Seller's address 3. Customer post office number 4. Quantity shipped. 5. Seller's telephone number 6. Seller's fax number 7. Seller's certificate number 8. Seller's certificate status 9. Noun description 10. Part number 11. Serial no(s) 12. Part manufacturer 13. Lot/batch number 14. Country of origin 15. Obtained from 16. Part condition (status) 17. Certificated agency name and number 18. Overhaul/Maintenance date l9. 1AManufacturing date 20. Manufacturer's expiration date 21. Time since new (TSN)

13 Page 13 of Time since overhaul (TSOH) 23. Maintenance record attached: NO X YES X 24. Manufacturer's certification (including lot, batch, and test data): NO X YES X 25. Obtained from aircraft, engine, etc., subjected to extreme conditions. NO X YES X If YES, explain. 26. Additional information 27. Authorized signature 28. Title 29. Date Appendix 2 Sample Format Description 1-6. Self-explanatory. 7. If the seller is FAA certificated, state certification. See item 8 in Appendix 1 of AC 20-62D References customer purchase order. 10. As referenced in the purchase order; if different, so state. 11. Serial number(s), if applicable. 12. Identify the part's original manufacturer. 13. Identify the manufacturer's lot batch number, if applicable. 14. Self-explanatory. 15. State seller's source of purchase. Specify if the part was obtained from a U.S. Government agency (including military). 16. Indicate status of part IAW AC 20-62D, paragraph 4, DEFINITIONS. 17. Name the last certificated agency to perform maintenance on

14 Page 14 of 14 the part. 18. State date of last overhaul or maintenance. 19. State date when part was originally manufactured, if known. 20. Self-explanatory. 21. For used parts, state time if known. TSN shall be determined for life-limited parts; TSN is desirable for all others: reference Appendix 1 of AC 20-62D 22. For used parts, state operating time since last overhaul. 23. Include maintenance records for used parts whenever possible, IAW AC 20-62D, Appendix 1, item If part is new or new surplus, seller should include the manufacturer's certification, including physical and chemical conformance test data. 25. If part (aircraft or engine) was obtained from an engine or assembly subjected to extreme damage, stress, heat, major failure, accident or fire, it should be specifically identified. 26. Any other data relevant to the part's status. 27. Signature. 28. Title of authorized agent. 29. Date of signature.