COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aero Resources J2 Series Gyroplanes AD/MCH/2 Critical Components - Retirement Life 8/73 Applicability: All model J2. Requirement: The following components shall be retired from service at or before the times shown below: Retirement Hours Component Part Number Max. Wt. 1500 lb. Max. Wt 1600 lb. Blade Assy Main Rotor 1500 1220 978* Tail Boom Assy RH 2100 11750 11750 Tail Boom Assy LH 2125 11750 11750 Trunnion Horizontal Stabilizer 2604 75800 75800 Controlex Assy Rudder 2717 300 300 Cable Assy Cyclic Control - Roll 2712 21000 1000 Cable Assy Cyclic Control - Pitch 27401 1000 1000 Bellcrank - Collective Control 2765 20600 20600 Control Rod Assembly - Collective 2777 37400 37400 Front Spar Assy - Wing 2801 39300 15347* Shaft Assy - Pitch Bearing 6505 5110 2250* Thrust Bearing MRC210-SZZ-T12 300 300 Tube Assy 'A' Frame 'U' Frame Assy LH 2381 1670 1670 Tube Assy 'A' Frame 'U' Frame Assy RH 2382 1670 1670 Stub Shaft 6638 1438 1438 When the maximum weight is increased from 1500 lb. to 1600 lb. the service life limit may be prorated in the following manner: D = A+C - C B COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES where 'A' is the actual hours on the component prior to modification. 'B' is the service life limit for the component at 1500 lb. GW. 'C' is the service life limit for the component at 1600 lb. GW. 'D' is the revised total prorated service life limit for the component (including the time prior to modification). Effective: 28 September 1973.