COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES C.A.C. CA-18 (Mustang) Series Aeroplanes AD/MUSTANG/2 Amdt 1 Main Landing Gear Pivot Shaft - Inspection 1/84 Applicability: All models engaged in aerial work or charter operations. Requirement: Inspect the main landing gear pivot shaft P/N 17-33163 or 66584 for cracking using an approved magnetic particle method. Compliance: At intervals not exceeding 250 landings, and within 10 landings following any heavy landing or other shock loading. Background: This Directive has been revised to delete aircraft not involved in aerial work or charter operations, and to clarify the part numbers of affected components.