83-24-08 BRITISH AEROSPACE AIRCRAFT GROUP: Amendment 39-4779. Applies to Model HS 748 series 2A airplanes, certificated in all categories. To prevent wing structural failure, accomplish the following, unless already accomplished:
A. Visually inspect the wing structure components for cracks in accordance with subparagraphs 2.B(1) through 2.B(5) and repair, if necessary, in accordance with paragraph 2.D of British Aerospace Aircraft Group HS 748 Service Bulletin 57/55, Revision 2, dated March 1980, prior to the accumulation of 10,000 landings, 12,000 flying hours, or within the next 750 flying hours after the effective date of this AD, whichever event occurs later. Repeat the inspections thereafter at intervals not to exceed 1,500 flying hours.
B. Perform an X-ray inspection of the lower wing surface butt straps and wing skin of both wings in accordance with subparagraph 2.B(6), and repair, if necessary, in accordance with paragraph 2.D of the service bulletin, prior to the accumulation of 10,000 landings, 12,000 flying hours, or 3,000 flying hours after the effective date of this AD, whichever event occurs later. Repeat the inspections thereafter at intervals not to exceed 4,000 flying hours.
C. For the purpose of this AD, and when approved by an FAA maintenance inspector, the number of landings may be computed by dividing each airplane's time in service by the operator's fleet average time from takeoff to landing for the aircraft type.
D. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, 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 for the accomplishment of inspections and/or repairs required by this AD.
This amendment becomes effective January 15, 1984.