COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters AD/BELL 206/68 Main Rotor Pillow Block Bushings - Replacement 11/75 Applicability: All models. Document: 1. Bell SB No. 206-75-3; or 2. FAA AD 75-18-07. Note: Agusta SB BT206-97 refers. Compliance: Within 600 hours time in service after 28 November 1975. Background: AD/Agusta 206/54 equivalent.