COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-18 and 19 (Super Cub) Series Aeroplanes AD/PA-18/5 Throttle Levers - Modification 11/60 Applicability: All models. Requirement: Rework the throttle as shown below. Compliance: Forthwith.