COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beagle B121 (Pup) Series Aeroplanes AD/BEA 121/30 Brake Torque Tube Assembly 4/96 Applicability: Beagle B121 Series 1, 2, and 3 aircraft. Requirement: Action in accordance with Jetstream Aircraft Mandatory Service Bulletin B121/103. Note: UK CAA AD 003-10-95 refers. Compliance: As specified in the Requirement Document. Background: Reports have been received of cracked brake torque tube assemblies on Bulldog aircraft. The brake torque tube assemblies installed on B121 aircraft, are of similar construction.