AD 85-10-01

85-10-01 BRITISH AEROSPACE: Amendment 39-5060. Applies to Model 3101 Jetstream (serial numbers 601 to 624 inclusive, and 627) airplanes certificated in any category.

Compliance: Required within 100 hours time-in-service after the effective date of this AD, unless already accomplished.

To assure that adequate clearance exists between the rear turbine bearing oil feed pipe and the bleed air pre-cooler accomplish the following:

(a) Inspect the rear turbine bearing oil feed pipe for chafing and for adequate clearance between the rear turbine bearing oil feed pipe and the bleed air pre-cooler on LH and RH engines in accordance with sub-paragraphs (a), (b) and (c) of the Part A - Inspection requirement of paragraph 2 of British Aerospace (BAe) Alert Service Bulletin No. 71-A-JM7418.

(1) If no damage is apparent and clearance is 0.25 inches (6.35 mm) or greater, no further action is required.

(2) If clearance is less than 0.25 inches and no pipe damage is apparent repeat the inspection required by paragraph (a) of this AD at intervals not to exceed 400 hours time-in-service or until either BAe Modification JM7418 or BAe Modification JM7388 is accomplished.

(3) If pipe damage is apparent, prior to further flight, accomplish either BAe Modification JM7418 or BAe Modification JM7388.

(b) Aircraft may be flown in accordance with Federal Aviation Regulation 21.197 to a location where this AD can be accomplished.

(c) An equivalent method of compliance with this AD, if used, must be approved by the Manager, Aircraft Certification Staff, AEU-100, Europe, Africa, and Middle East Office, FAA, c/o American Embassy, 1000 Brussels, Belgium.

This amendment becomes effective on June 18, 1985.