# AD 91-20-07: Fuel Feedline Adapter - Type: Airworthiness directive - Status: Historical - Products: Airbus Industrie A300 Model B2-1A, A300 Model B2-1C, A300 Model B2-203, A300 Model B2K-3C, A300 Model B4-103, A300 Model B4-203, A300 Model B4-2C, A300 Model B4-600 Series, A300 Model B4-600R Series, A300 Model F4-600R Series, A300B4-601, A300B4-603 and 13 more - Effective: October 7, 1991 - Superseded by: [AD 2000-02-38](https://openairdocs.org/ad/2000-02-38) - Product type: Aircraft, Large airplane - Amendment: 39-8041 - Docket: 91-NM-180-AD - Registered aircraft: 122 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4CCFEB341AD2AC668625695E006F2587.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/91-20-07 ## The airworthiness directive 91-20-07 AIRBUS INDUSTRIE: Amendment 39-8041. Docket No. 91-NM-180-AD. Applicability: Model A300, A300-600, and A310 series airplanes equipped with an auxiliary power unit (APU) fuel feedline adapter, P/N A4937021700000 (welded configuration), certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent an APU compartment fire, accomplish the following: (a) Within 100 hours time-in-service after the effective date of this AD, and thereafter at intervals not to exceed 400 hours time-in-service; perform a dye penetrant inspection to detect cracks, rupture, or fuel leaks at the weld of the fuel feedline adapter, in accordance with Airbus Industrie All Operators Telex (AOT) 49-01, Issue 3, dated April 25, 1991: (1) If cracks, rupture, or fuel leaks are found, replace the adapter with an improved, non-welded one-piece-body adapter prior to the next APU operation, or placard the APU inoperative until the adapter isreplaced with the improved adapter, in accordance with Airbus Industrie Service Bulletin A300-49-0049, A300-49-6009, or A310-49-2012, all dated July 12, 1991, as applicable. (2) Installation of an improved, non-welded one-piece-body adapter, in accordance with the Airbus Industrie Service Bulletin A300-49-0049, A300-49-6009, or A310- 49-2012, all dated July 12, 1991, constitutes terminating action for the repetitive inspections required by paragraph (a) of this AD. (b) Within 100 hours time-in-service after the effective date of this AD, verify the correct torque values of the starter motor cable terminals and the generator cable terminals in accordance with Airbus Industrie All Operators Telex (AOT) 49-01, Issue 3, dated April 25, 1991. Correct any torque value discrepancies, prior to further flight, in accordance with the AOT. (c) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113. (d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. (e) The inspection requirements shall be done in accordance with Airbus Industrie All Operators Telex (AOT) 49-01, Issue 3, dated April 25, 1991. The replacement requirements shall be done in accordance with Airbus Industrie Service Bulletin A300-49-0049, A300-49- 6009, or A310-49-2012, all dated July 12, 1991. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Airbus Industrie, Airbus Support Division, Avenue Didier Daurat,31700 Blagnac, France. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C. This amendment (39-8041, AD 91-20-07) becomes effective on October 7, 1991. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A35EU](https://openairdocs.org/tcds/A35EU): Airbus SAS; names 14 of 17 models: A310-203, A300 B4-622R, A300 F4-605R, A300 B4-601, A310-221, A300 B4-603, A310-324, A300 F4-622R… ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 122 (122 by airframe model, 0 by engine model) - Makers: Airbus Industrie 74, Airbus 48 Models with the most aircraft: - [Airbus Industrie A300 F4-605R](https://openairdocs.org/model/airbus-industrie-a300-f4-605r): 36 aircraft (airframe model) - [Airbus A300 F4-622R](https://openairdocs.org/model/airbus-a300-f4-622r): 31 aircraft (airframe model) - [Airbus Industrie A300 F4-622R](https://openairdocs.org/model/airbus-industrie-a300-f4-622r): 21 aircraft (airframe model) - [Airbus A300 B4-622R](https://openairdocs.org/model/airbus-a300-b4-622r): 11 aircraft (airframe model) - [Airbus Industrie A300 B4-622R](https://openairdocs.org/model/airbus-industrie-a300-b4-622r): 10 aircraft (airframe model) - [Airbus A300 F4-605R](https://openairdocs.org/model/airbus-a300-f4-605r): 6 aircraft (airframe model) - [Airbus Industrie A300 B4-605R](https://openairdocs.org/model/airbus-industrie-a300-b4-605r): 3 aircraft (airframe model) - [Airbus Industrie A310-203](https://openairdocs.org/model/airbus-industrie-a310-203): 2 aircraft (airframe model) - [Airbus Industrie A310-222](https://openairdocs.org/model/airbus-industrie-a310-222): 2 aircraft (airframe model) All 9 models: https://openairdocs.org/ad/91-20-07/models.md Every aircraft: https://openairdocs.org/ad/91-20-07/aircraft.md ## Related documents - [AD 2000-02-38](https://openairdocs.org/ad/2000-02-38): Auxiliary Power Unit (APU) Fuel Feedline Adapter · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 21 more. Effective Mar 13, 2000. Supersedes this AD Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.