COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Grumman G21 (Goose) Series Aeroplanes AD/G21/1 Below Floor Control System Components - Inspection 10/77 Applicability: All models. Requirement: 1. Remove and disassemble: (i) Elevator Torque Tube Assembly P/N 12755, (ii) Rudder Torque Tube Assembly P/N 12756, (iii) Rudder Pedal Torque Tube Assembly LH and RH P/N 12757 and 12758, (iv) Hinge Support Assembly P/N 12725. 2. Inspect all parts for corrosion and/or cracks using visual and dye penetrant or magnetic particle techniques. Note: FAA AD 73-12-6 Amendment 39-1657 refers. Compliance: Initially before issue of Certificate of Airworthiness and there- after at intervals not exceeding 2000 hours time in service or two years whichever occurs first.