COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Grumman G21 (Goose) Series Aeroplanes AD/G21/4 Rudder Control Push-Rod Assembly P/N 12727-1 - Inspection 10/77 Applicability: All models. Requirement: 1. Remove rudder control push rod assembly P/N 12727-1. 2. Thoroughly clean both rod end fittings. 3. Inspect both fittings for cracks using a dye penetrant technique in conjunction with at least a 10X magnifying glass. Note 1. Push rod assembly P/N 12727-1 is connected to the LH rudder pedals and is located below the pilot's compartment floor approximately 240 mm to the right of the aircraft centre line. Note 2. FAA AD 63-27-2 Amendment 655 refers. Compliance: Inspect initially before issue of Certificate of Airworthiness and thereafter at intervals not exceeding 100 hours time in service.