COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F28 Series Aeroplanes AD/F28/51 Main Landing Gear Bay Cracking 2/86 Applicability: All model F28 with S/Nos 11003 to 11091, 11094 to 11135, 11991 and 11992. Requirement: Action in accordance with Fokker SB F28/57-76. Note: RLD AD 85-87 refers. Compliance: Prior to 31 March 1986. The manufacturer reports an instance of a crack in the area of Station 2635 and the rear spar.