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 206/44 Rotor Brake Disc Assembly P/N 4000071 - Inspection and Modification Applicability: All models fitted with rotor brake kit P/N 206-706-032-1. Document: Bell SB No. 206-50-73-2. 5/73 Compliance: 1. For Part 1 of SB 206-50-73-2 For helicopters estimated to have had 300 or more rotor brake stops - within the next 25 rotor brake applications after 19 April 1973. For helicopters estimated to have had less than 300 rotor brake stops - prior to 325 rotor brake stops. 2. For Part 2 of SB 206-50-73-2: At intervals not exceeding 300 hours time in service. Background: AD/Agusta 206/33 equivalent.