COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/75 Amdt 2 Applicability: All models. Forward and Aft Cargo Door Stops - Inspection and Modification 3/78 Document: Boeing SB No. 727-52-A102, Rev. 3. Compliance: Unless already accomplished, initially inspect as per requirement document and thereafter at intervals not exceeding 1650 flights until modified.