COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gates Learjet 35 and 36 Series Aeroplanes AD/LEARJET 35/11 Elevator Control System - Modification 1/79 Applicability: All model 35 with S/Nos. 35-002 to 35-041 and all model 36 with S/Nos. 36-002 to 36-016, unless modified in accordance with Kit Nos. AMK 75-10 or AMK 75-10A. Requirement: To provide for increased reliability of the elevator control system: Modify the aeroplane by installing Kit No. AMK 75-10A. Compliance: Within 300 hours time in service after 31 January 1979.