83-14-01 SHORT BROTHERS LTD.: Amendment 39-4681. Applies to SC7 Skyvan Series 3 airplanes certificated in any category.
Compliance: Required as indicated, unless already accomplished.
To prevent failure of the flaps, accomplish the following:
(a) For all affected aircraft, except SNs SH1845 and SH1883, within the next 50 flights after the effective date of this AD or upon accumulating 7,000 flights, whichever occurs later, and thereafter at each subsequent 7,000 flights:
(1) Inspect the inboard flap outer hinge arm and operating arm attachment ribs and replace the outer hinge arm in accordance with Part 1 of the Accomplishment Instructions Section of Short Brothers Service Bulletin No. 57-A61, Rev. 5, dated October 28, 1980, or an FAA approved equivalent.
(b) Within the next 250 flights after the effective date of this AD or upon accumulating 7,000 flights, whichever occurs later:
(1) Modify the outboard flap attachment ribs at the inboard hinge arm and operating arm in accordance with Part 1 of the Accomplishment Instructions Section of Short Brothers Service Bulletin No. 57-62, Rev. 1, dated September 9, 1980, or an FAA approved equivalent.
(c) For S/Ns SH1845 and SH1883 only:
(1) Accomplish the initial inspection and outer hinge arm replacement described in paragraph (a) (1) of this AD within the next 250 flights after the effective date of this AD.
(2) Accomplish the modification described in paragraph (b)(1) of this AD within the next 250 flights after the effective date of this AD.
(d) For all affected aircraft, including S/Ns SH1845 and SH1883, replace the outboard flap inner hinge arm, P/N SC7-25-39, operating arm, P/N SC7-25-107/8, inboard flap inner hinge arm, P/N SC7-25-39, operating arm P/N SC7-25-109/110, and their associated attachment ribs at 20,000 flights or 18,000 flights, as defined by Short Brothers Life Extension Service Bulletin No. 51-51, Rev. 1, dated October 19, 1978, in accordance with Short Brothers ServiceBulletin No. 57-A61, Rev. 5, dated October 28, 1980, or an FAA approved equivalent.
(e) For purposes of complying with this AD, subject to acceptance by the assigned FAA maintenance inspector, the number of flights may be determined by multiplying each airplane's hours time-in-service by 2.
(f) An equivalent means of compliance with this AD may be used if approved by the Manager, Aircraft Certification Office, FAA, c/o American Embassy, 1000 Brussels, Belgium.
This amendment becomes effective on August 19, 1983.