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/10 Spoiler Centre Hinge Brackets - Inspection 6/75 Applicability: Model 24 with S/Nos. 24-100 to 24-301, -309, -310, -313 and -314. Model 25 with S/Nos. 25-002 to 25-185. Document: Gates Learjet SB 23/24/25-262. Compliance: Within the next 100 hours time in service after 31 July 1975.