COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gates Learjet 24 & 25 Series Aeroplanes AD/LEARJET/1 Horizontal Stabiliser - Inspection 6/73 Applicability: All model 24 with S/Nos. 24-100 to 24-257 and model 25 with S/nos. 25-003 to 25- 100. Document: Gates Learjet SB No. 23/24/25 - 240. Compliance: As detailed in the requirement document.