COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes AD/LA-4/9 Rudder Bellcrank - Inspection 3/74 Applicability: All models. Document: Consolidated Aeronautics SL L-50. Compliance: Within 100 hours time in service after 30 April 1974, and there- after at intervals not exceeding 1 year or at anytime rudder pedals are subjected to abnormal loads.