COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Pratt and Whitney Canada Turbine Engines - PT6A Series AD/PT6A/19 Fuel Control Bypass Valve Diaphragm 10/85 Applicability: PT6A-38, -41 and 45A engines fitted with Aviation Electric Fuel Control Units P/No 3244723-3 thru -10, 3244738-5, 3244738-6, 3244752-6 thru -10, and 3244755-7 thru- 11. Document: 1. Pratt & Whitney Aircraft of Canada SB No. 3103; 2. FAA AD 78-17-07, Amendment 39-3287; or 3. AD/UAC-T/31. Compliance: Within the next 100 hours time in service after 30 November 1978.