AD 77-14-05

77-14-05 BRITISH AIRCRAFT CORPORATION: Amendment 39-2953. Applies to BAC 1- 11 200 and 400 series airplanes, certificated in all categories, with Garrett AiResearch Models GTCP 85-115, -115C or -115CK APU's installed, that do not have British Aircraft Corporation Modification PM 5217 incorporated.

Compliance is required as indicated.

To prevent excessive fuel contamination of the Auxiliary Power Unit oil contents, accomplish the following:

(a) Within the next 60 APU hours' time in service after the effective date of this AD, unless accomplished within the last 20 APU hours' time in service, and thereafter at intervals not to exceed 80 APU hours' time in service from the last inspection, inspect for fuel leakage in accordance with paragraph 2.1 of the Accomplishment Instructions of British Aircraft Corporation Model BAC 1-11 Service Bulletin 49-PM 5217, or an FAA-approved equivalent.

(b) If the fuel leakage rate exceeds one drop per minute, prior to further use of the APU, rectify the leakage, drain and refill the oil system with fresh oil, and thereafter continue the inspections required by paragraph (a) of this AD.

(c) Upon the request of an operator, the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region, c/o American Embassy, APO New York, N.Y. 09667, may adjust the repetitive inspection intervals specified in paragraph (a) of this AD if the request contains substantiating data to justify the change.

This amendment becomes effective August 5, 1977.