AD 91-20-07

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.