COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 77 (Skipper) Series Aeroplanes AD/BEECH 77/3 Aileron Torque Tube Bearings 4/80 Applicability: All model 77 with S/Nos. WA-1 to WA-78, WA-80 to WA-86 and WA-88. Requirement: Action in accordance with Beechcraft SI No. 1119. Compliance: Within 25 hours' time in service after 17 March 1980. Background: It is possible for the aileron torque tube to bind in the flap spool during flight.