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 121/20 Throttle Cable Assembly 4/78 Applicability: All model B121 Series 2 and 3. Requirement: Replace throttle cable assembly P/N BE.47.20017 with P/N BE.47.20037 for Series 2 aircraft and P/N BE.47.30019/1 with P/N BE.47.30025 for Series 3 aircraft. Note: Scottish Aviation SB No. B121/74 also refers. Compliance: Before 31 May 1978.