88-03-02 BRITISH AEROSPACE: Amendment 39-5835. Applies to all Model H.S. 748 series airplanes, which have been modified in accordance with British Aerospace (BAe) Service Bulletins 57/31, 57/32, or 57/33, certificated in any category. Compliance required as indicated, unless previously accomplished.
To prevent further cracking which could lead to reduced structural capability of the wing, accomplish the following:
A. On airplanes previously modified in accordance with BAe Service Bulletin 57/31 or 57/33, inspect and modify the lower wing skins in accordance with BAe Service Bulletin 57/81, Revision 1, dated October 1985, prior to 7,500 hours since modification in accordance with BAe Service Bulletins 57/31 or 57/33, or within the next 750 hours time in service after the effective date of this AD, whichever occurs later.
B. On airplanes previously modified in accordance with BAe Service Bulletin 57/32, inspect and modify the lower wing skins in accordance with BAe Service Bulletin 57/82, Revision 1, dated November 1985, prior to 10,000 hours since modification in accordance with BAe Service Bulletin 57/32, or within the next 750 hours time in service after the effective date of this AD, whichever occurs later.
C. Any cracks found during the inspections required by paragraphs A. or B., above, must be repaired, prior to further flight, in accordance with BAe Service Bulletin 57/81, Revision 1, dated October 1985, or BAe Service Bulletin 57/82, Revision 1, dated November 1985, as applicable.
D. 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.
E. 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, Inc., Service Bulletin Librarian, P.O. Box 17414, Dulles International Airport, Washington D.C. 20041. These documents 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 March 1, 1988.