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 206/27 Voltage Regulator - Replacement 8/70 Applicability: All models equipped with voltage regulator P/N 206-075-027-3. Document: Bell SL No. 206A-139, Rev. B. Note: Agusta SB No. BT206-44 refers. Compliance: Within 300 hours time in service after 31 August 1970. Background: AD/Agusta 206/19 equivalent.