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 35/3 Lower Cabin Door Jambs - Inspection 4/76 Applicability: All model 35 with S/Nos. 35-001 to 35-035. And all model 36 with S/Nos. 36-001 to 36-016 with the 24 inch cabin door. Document: Gates Learjet SB 35/36-52-1. Compliance: Within 75 hours time in service after 30 April 1976.