COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F28 Series Aeroplanes AD/F28/11 Landing Gear - Mechanical NK Control Systems - Modification Applicability: All models with S/Nos. 11003 to 11024 and 11991 to 11993. Document: Fokker SB F28/32-33 Para. 2, Parts II and III. Compliance: Before 30 April 1971.