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 206/1 Fuel Booster Pump Wiring - Modification 11/67 Applicability: All model 206A with S/Nos. 4 to 20, 22 to 48, 50 to 56 59, 61 and 63. Document: Bell SL No. 206A - No. 21 Rev. A. Compliance: Before 1 September 1971.