COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Brantly B-2 Series Helicopters AD/B-2/30 Amdt 3 Retirement Life - Critical Components 2/73 Applicability: All model B-2. Requirement: The following components shall be retired from service at or before the times shown below. Main Rotor System Part Number Max. Operating Hours time in service Outboard Main Rotor Blades (except spar assy. P/N 248-45) 248-40 500 Outboard Main Rotor Blades (except spar assy P/N 248-45) 248-46 500 Outboard Main Rotor Blade 248-53 2500 Outboard Main Rotor Blade 248-100 2500 Outboard Main Rotor Blade 248-101 2500 Lag Hinge Block 4-1 2500 Lag Hinge Block 4-12 2500 Hub and Pylon Assy (when used with outboard blades P/N 248-40) 333 2500 Control Tube Assy - Main Rotor (when used with outboard blades P/N 248-40) 305-2 1310 Control Tube Assy - Main Rotor (when used with outboard blades P/N 248-46, 248-53, 248-100 and 248-101) 305-2 2500 Inboard Yoke 280-4 2500 Hub and Inboard Blade Assy. 305-1 2500 Pylon Outboard Bearing Shaft (Part of Hub and Inboard Blade Assy.) 280-5 or 280-6 500 Main Rotor Hub Clevis Bearings: Part Number Max. Operating Hours time in service Outer Race SJ7275SS 600* COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Inner Race IR7275, M1- 19 or 34466 600* * Bearings must be rotated as specified in Section III of Maintenance Manual after 300 hours time in service. Drive System Part Number Max. Operating Hours time in service Transmission Assy. 324 2500 Free Wheeling Clutch Assy. 10-11 2500 Free Wheeling Clutch Cage 10-2 300 Overrunning Clutch (Formsprag) CL-40237 2500 Drive Shaft Extension Assy. 108-33 2500 Intermediate Gear Box Assy. 278-100 2500 Tail Rotor Gearbox Assy. 278-200 2500 Effective: Forthwith.