COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Propeller Governors AD/GOV/2 Governor Body - Inspection 9/71 Applicability: All Hamilton Standard Two-Flyweight Model 4U18 and 5U18 Governors. Document: 1. Hamilton Standard SB No. 518; or 2. FAA AD 57-16-4; or 3. AD/PHS/4. Compliance: Before installation in an aircraft.