COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Brantly B-2 Series Helicopters AD/B-2/29 Amdt 1 Tail Rotor Drive Shaft - Inspection and Corrosion Proofing 12/68 Applicability: All model B2, B2A and B2B. Document: Brantly SB No. B2B-68-2A. Compliance: Within 10 hours time in service after 31 December 1968.