COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 76 (Duchess) Series Aeroplanes AD/BEECH 76/7 Aileron and Rudder Bellcrank Stop Bolt Nuts 12/79 Applicability: As detailed in Beechcraft SI No. 1087. Requirement: Action in accordance with Beechcraft SI No. 1087. Compliance: Within 25 hours' time in service from 16 November 1979. Background: There is a possibility that non self-locking nuts are fitted to the affected stop bolts.