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 121/24 Fuselage Angle, Diaphragm and Flange at Tailplane Spar Attachments 7/84 Applicability: All B121 series 1, 2 and 3 aeroplanes which have exceeded 2450 hours time in service. Requirement: Action in accordance with British Aerospace (Scottish Division) SB No. B121/86. Compliance: Within 50 hours time in service after 8 June 1984 and thereafter a intervals not exceeding 50 hours time in service. Background: The manufacturer reports that cases of rear fuselage cracks in the area of the tailplane attachment have been discovered in service.