COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pratt and Whitney Turbine Engines - JT9D Series AD/JT9D/3 Diffuser Case 8/72 Applicability: Model JT9D-3A fitted with P/N 669647 diffuser cases. Document: 1. Pratt & Whitney SB No. 2901, Rev. 9; or 2. AD/PW-T/29A. Compliance: In accordance with the Requirement Document.