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/T53/9 Second Stage Gas Producer Cylinder Bolts - Replacement 1/86 Applicability: All T5313 Series and T53-L-13 Series except those exempted in Lycoming Service Bulletin No. 0028 Rev. No. 2. Document: 1. Lycoming SB No. 0028, Rev. 2; or 2. FAA AD 75-12-12; or 3. AD/LYC-T/10B. Compliance: As per paragraph 1D of Lycoming SB No. 0028, Rev. No. 2, with effect from 28 February 1975.