COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES General Electric Turbine Engines - CT58 Series AD/CT58/5 Stage 1 and Stage 2 Turbine Wheel 9/85 Applicability: All CT58 engine fitted with Stage 1 and 2 turbine wheels listed in SB (CT58) 72-126, Rev. 1. Document: General installation in an aircraft following next complete overhaul after 23 March 1970; or AD/GE-T/14A. Compliance: Before installation in an aircraft following next complete overhaul after 23 March 1970.