COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 336 Series Aeroplanes AD/CESSNA 336/9 Flap Actuator - Inspection and Modification 2/73 Applicability: All models with S/Nos. 336-0001 to 336-0195. Requirement: PART 1 - Inspect actuator jack screw and clean and relubricate in accordance with Cessna SL SE60-16. PART 2 - Modify the aircraft in accordance with Cessna SL ME72-19. Compliance: For Part 1 : At intervals not exceeding 100 hours time in service after 28 February 1973 until modified. For Part 2 : Before 1st June 1973.