COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SC7 (Skyvan) Series Aeroplanes AD/SC7/17 Outer Flap - Replacement of Lifed Items and Reinforcement of Flap Structure Applicability: All Skyvan series 3, 3A and 3M. Document: Short SB No. 57-62. Compliance: As detailed in the requirement document. 7/80 Background: Retirement of hinge arms and operating arms, and reinforcement of the flap structure, are required as part of the life extension modification and to ensure the continued airworthiness of the flaps.