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 206/34 Amdt 1 Strap P/N 206-031-200-23 and -24 - Replacement 4/75 Applicability: All models 206A, 206B and AB206 with S/Nos. detailed in requirement documents. Document: Bell SB No. 206-01-74-2, or Agusta SB No. BT206-91. Compliance: Within 1200 hours time in service after 30 April 1975. Background: AD/Agusta 206/50 equivalent.