COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Auster/Beagle A.61 Series Aeroplanes AD/AUS/3 Tailplane Bracing 2/50 Applicability: All models manufactured before July 1947. Requirement: Action in accordance with Auster SB Issue 10, or Auster Mod. No. 1381. Compliance: Forthwith.