COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES C.A.C. CA-6 (Wackett Trainer) Series Aeroplanes AD/CA-6/1 Tail Wheel Stabiliser Locknut - Inspection NK Applicability: All models. Requirement: Check the tightness of the tailwheel bungee stabiliser locknut (Part No. 06-34041). Compliance: At intervals not exceeding 25 hours time in service.