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-2/4 Tail Rotor Drive - Modification 12/60 Applicability: All model B-2 prior to S/No. 44. Document: 1. Brantly SB No. 4; or 2. FAA AD 60-26-3. Compliance: Forthwith.