COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pilatus Porter PC-6 Series Aeroplanes AD/PC-6/24 Amdt 1 Aileron Balance Weight Bolts - Modification 9/68 Applicability: All models. Document: Pilatus SB No. 81. Compliance: Before 5 September 1968.