AD 90-08-11

90-08-11 BRITISH AEROSPACE: Amendment 39-6568. Docket No. 89-NM-234-AD.

Applicability: Model BAe 146-100A, Serial Numbers E1002 and subsequent; Model BAe 146-200A, Serial Numbers E2012 and subsequent; and Model BAe 146-300A, Serial Numbers E3118 and subsequent; certificated in any category.

Compliance: Required within 180 days after the effective date of this AD, unless previously accomplished.

To prevent loss of wing flap asymmetry protection and reduced airplane controllability, accomplish the following:

A. Install an improved wing flap electronic control unit (ECU) in accordance with British Aerospace Service Bulletin 27-95-70420A, dated April 27, 1989.

NOTE: The British Aerospace Service Bulletin references Dowty Rotol Service Bulletin 146-27-75 for additional instructions.

B. Install a warning placard on the front face of the ECU, in accordance with British Aerospace Service Bulletin 27-95-70420A, dated April 27, 1989. The warning placard states:

"WARNING - This equipment must not be removed or re-racked in flight."

C. An alternate means 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, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either 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.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to British Aerospace, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6568, AD 90-08-11) becomes effective on May 14, 1990.