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-2/13 Tail Rotor Guard - Inspection 3/61 Applicability: All model B-2. Document: Brantly SL No. 22. Compliance: At each daily or overnight inspection.