COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/126 Main Deck Cargo Door 3/91 Applicability: Model 727 and 727-100 series aircraft equipped with main deck cargo doors installed in accordance with STC SA1368SO. Requirement: Action in accordance with the technical requirements of FAA AD 90-21-19 Amdt 39-6765. Note: Aeronautical Engineers, Inc. (AEI), Service Bulletin Report No R-690 refers. Compliance: Before 1 April 1991. Background: The results of an FAA audit of the cargo door installation revealed that six cargo door latch lockpins were removed by virtue of a revision to STC SA1368SO.