COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F28 Series Aeroplanes AD/F28/33 Auxiliary Power Unit Exhaust - Inspection 7/76 Applicability: All models with S/Nos. 11003 to 11101 and 11991 to 11993 unless SB F28/49-21 has been accomplished. Document: 1. Fokker SB F28/49-24; or 2. RLD AD A21/76. Compliance: As detailed in the requirement document.