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 206/46 Amdt 1 Tailboom Skin Splice - Inspection 3/74 Applicability: All models AB206A and AB206B, 206A and 206B prior to S/Nos. 945. Document: Bell SB 206-01-73-4, Rev. B. Note: Agusta SB No. BT206-62 refers. Compliance: At intervals not exceeding 100 hours time in service after 29 March 1974. Background: AD/Agusta 206/37 equivalent.