AD 81-16-08 R3
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Gates Learjet Models 24E, 24F, 25D and 25F Series Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Gates Learjet Models 24E, 24F, 25D and 25F Series Airplanes |
| aircraft | Learjet Inc. | 25D | Airworthiness Directives; Gates Learjet Models 24E, 24F, 25D and 25F Series Airplanes |
| aircraft | Learjet Inc. | 25F | Airworthiness Directives; Gates Learjet Models 24E, 24F, 25D and 25F Series Airplanes |
Unsafe Condition
Failure of the horizontal stabilizer trim actuator or autopilot systems could result in an unsafe condition due to system malfunction, leading to loss of control or inability to maintain safe flight characteristics at high altitudes.
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Required Actions
Insert specific altitude limitations in the FAA-approved Airplane Flight Manual (AFM) before further flight. Modify flight control systems, stall warning systems, and control wheels using specified modification kits. Install required AFM changes and supplements. Perform modifications at an FAA-certificated maintenance repair agency by May 31, 1982.
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Compliance Time
On or before May 31, 1982
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Affected Aircraft
Gates Learjet Models 24E (serial numbers 350, 352, 353, 354, 356 and subsequent), 24F (serial numbers 350 and subsequent with CJ610-8A engines), 25D (serial numbers 206 thru 336, 338 thru 341), and 25F (same serial ranges as 25D).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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