COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pratt and Whitney Turbine Engines - JT8D Series AD/JT8D/13 No. 4 1/2 Bearing - Removal From Service 10/77 Applicability: JT8D engine models containing Number 4 1/2 bearing P/N 707007, bearing S/Nos. 800 through to 999, and S/Nos. 100A through to 214A. Document: 1. FAA AD 77-16-12 : Amendment 39-3008; or 2. Pratt & Whitney Alert Service No. 4639, Rev. 2; or 3. AD/PW-T/44. Compliance: 1 December 1977.