COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES AlliedSignal (Lycoming) Turbine Engines - T53 Series AD/T53/15 Fuel Regulator - P1 Multiplier Connector Assembly Damping 1/86 Applicability: All T53 engines fitted with Chandler Evans Corporation (CECO) Fuel Regulators. Document: 1. Lycoming SB 0048, Rev. 1; or 2. FAA AD 77-17-08 Amdt. 39-3019 as amended by Amdt. 39-3165; or 3. AD/LYC-T/16A. Compliance: Before 31 July 1978.