COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/24 Amdt 2 Applicability: All models. Inboard Flap Drive Angle Gearbox Housing - Inspection and Modification 5/67 Document: Boeing SB No. 27-84, Rev. 2. Compliance: Forthwith.