COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SC7 (Skyvan) Series Aeroplanes AD/SC7/1 Left Front Engine Shockmount - Inspection and Replacement Applicability: All models of series 3 not incorporating Mod. 763. Document: Short SB No. 71-50. 6/69 Compliance: 1. Inspect in accordance with Part 1 of SB No. 71-50 at intervals not exceeding 100 hours time in service until modified to Part 2. 2. Modify in accordance with Part 2 of SB No. 71-50 before exceeding 1500 hours total time in service.