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 206/63 Horizontal Stabilizer - Modification 10/74 Applicability: All models 206A and 206B with S/Nos. 1 to 1251 except those which have incorporated Bell Kit P/N 206-704-096-3. Document: Bell SB No. 206-01-74-1, Rev. B. Compliance: Within 100 hours time in service after 31 October 1974.