COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F28 Series Aeroplanes AD/F28/32 Aileron Feel Trim Spring System - Inspection 6/76 Applicability: All models with S/Nos. 11003 to 11077 and 11991 to 11993. Document: Fokker SB F28/27-122. Compliance: At intervals not exceeding 100 hours time in service until modified in accordance with SB No. F28/27-92.