COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 747 Series Aeroplanes AD/B747/126 Pneumatic Duct Coupling 9/94 Applicability: All model 747 series aeroplanes with line position 1 through 219 inclusive. Requirement: Action in accordance with the technical requirements of FAA AD 94-09-13 Amdt 39- 8902. Note: Purolator Service Bulletin FSC-912 dated December 1972 refers. Compliance: As specified in the Requirement Document. Background: Failures of certain duct couplings installed on the wing leading edge pneumatic duct have been reported.