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/28 Automatic Flight Control Systems - Inspection and Modification Applicability: All models 25, 25A with S/Nos. 25-003 thru 25-066 except 25-061. All models 25B, 25C with S/Nos. 25-061, 25-067 thru 25-205. 4/83 Requirement: 1. Modify the flight control systems in accordance with the following modification kits: MODEL MODIFICATION KITS 25B and 25C AMK 81-9, *AMK 81-8 and AMK 80-13 Change 3. 25 and 25A AMK 81-10 Change 1, *AMK 81-8 and AMK 80-13 Change 3. * Kit AMK 81-8 does not apply unless Kit AAK 76-4 has been installed. 2. Inspect the stall warning accelerometer in accordance with Gates Learjet Service Bulletin 23, 24, 25-301B. Note. FAA AD 82-01-04 Amendment 39-4296 refers. Compliance: On or before 30 April 1984. Background: This action is necessary to reduce the hazard created by a possible malfunction which if not detected could result in a hazardous flight attitude.