COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes AD/AC/62 Forward and Aft Inboard Wing Spar Cap Rivets - Inspection and Replacement 4/77 Applicability: All models 690, 690A and 690B with S/Nos. 11000 to 11366, 11368, 11369, 11370 and 11371. Document: 1. Rockwell International SB No. 163; or 2. FAA AD 77-03-01 Amend 39-2823. Compliance: 1. Initially inspect before further flight, unless accomplished in the preceding 25 hours time in service, and thereafter at intervals not exceeding 25 hours time in service until replaced. 2. Replace rivets not later than next major inspection after 30 April 1977.