AD 80-26-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24A | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24B | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24B-A | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24C | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24D | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24D-A | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Gates Model 23, 24, 25, 28 and 29 Series Airplanes |
Unsafe Condition
Failure of the AFCS/AFC-SS pitch function could result in loss of pitch control or unintended pitch trim movement, leading to possible loss of aircraft control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Deactivate the AFCS/AFC-SS pitch function by pulling and banding the circuit breaker, install a placard indicating inoperative pitch axis, update the AFM with approved changes, inspect the elevator control system, and modify the airplane with specified modification kits by April 1, 1981.
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Compliance Time
Before further flight and on or before April 1, 1981
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Affected Aircraft
Gates Learjet Model 23, 24, 25, 28, and 29 series airplanes certificated in all categories, with specific serial ranges as listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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