79-16-03 SHORT BROTHERS LIMITED: Amendment 39-3522. Applies to Model SD3-30 airplanes, Serial Numbers SH.3001 through SH.3013, certificated in all categories.
Compliance is required prior to the accumulation of 10,000 flights, or within the next 100 flights after the effective date of this AD, whichever occurs later, unless already accomplished.
To prevent fatigue of the affected components and possible structural failure of the wing, accomplish the following:
(a) Inspect to determine the adequacy of packing and shimming material between wing drag link attachment longerons and spar frames on the left and right sides of the airplane, and inspect the flange of Cleats SD3 11-0479/A and SD3 11-0480/A and Brackets SD3 11-1119, SD3 11-1121, and SD3 11-1123 for deformation due to the tightening of the bolts with inadequate packing or shimming under the flange, all in accordance with Section 2, "Accomplishment Instructions" of Short Brothers, Ltd. Service Bulletin SD3-53-29,dated June 21, 1978 (hereinafter referred to as the Service Bulletin) or an FAA-approved equivalent.
NOTE - As used in the Service Bulletin the term "packing" means thick shimming. In British usage, shim stock is measured in thousandths and packing stock is measured in sixteenths.
(b) If, during the inspection required by paragraph (a) of this AD, inadequate packing or shimming material is found, repack and reshim, as necessary, in accordance with Section 2 of the Service Bulletin or an FAA-approved equivalent.
(c) If, during the inspection required by paragraph (a) of this AD, it is found that the flange of a part specified in paragraph (a) of this AD is deformed due to the tightening of the bolts with inadequate packing under the flange, replace the part with a new part of the same part number and ensure that the packing and shimming material between wing drag link attachment longerons and spar frames is adequate, all in accordance with Section 2 of the Service Bulletin or an FAA-approved equivalent.
(d) For purposed of this AD, an FAA-approved equivalent must be approved by the Chief, Aircraft Certification Staff, AEU-100, FAA, Europe, Africa, and Middle East Region, c/o American Embassy, Brussels, Belgium, Telephone 513.38.30.
(e) For purposes of this AD, a flight consists of one take-off and one landing.
This Amendment becomes effective August 13, 1979.