87-25-13 BRITISH AEROSPACE: Amendment 39-5799. Applies to all Model H.S. 748 series airplanes with Modification 1472 incorporated, but without Modification 7513 incorporated, certificated in any category. Compliance required as indicated, unless previously accomplished.
To prevent inability to lower or lock down the nose gear for landing, accomplish the following:
A. Prior to the accumulation of 7,000 landings or within the next 90 days after the effective date of this AD, whichever occurs later, replace nose landing gear jack support bracket bearing cap attachment studs, Part Number 2cD13248, in accordance with British Aerospace Alert Service Bulletin A53/53 Revision 1, dated May 1987.
B. Replacement studs must, in turn, be replaced prior to accumulation of 7,000 landings.
C. Until studs exceeding a life of 7,000 landings have been replaced, nose landing gear jack support structure must be inspected prior to each day's first flight to ensure each stud and bearing cap are secure and correctly fitted in accordance with British Aerospace Alert Service Bulletin A53/53, Revision 1, dated May 1987.
D. On assemblies where the bearing caps or studs are found loose, all four bearing cap attachment studs must be replaced before the next flight, in accordance with British Aerospace Alert Service Bulletin A53/53, Revision 1, dated May 1987.
E. Incorporation of Modification 7513, as described in British Aerospace Alert Service Bulletin A53/53, Revision 1, dated May 1987, constitutes terminating action for requirements of paragraphs A., B., C., and D., above.
F. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety and which has the concurrence of an FAA Principal Maintenance Inspector, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.
G. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD.
All persons affected by this directive who have not already received the appropriate service information 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. This information may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.
This amendment becomes effective January 25, 1988.