AD 79-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24A | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24B | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24B-A | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24C | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24D | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24D-A | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
| aircraft | Learjet Inc. | 24F-A | Airworthiness Directives; Learjet Model 24E, 24F, 24F-A, 25D and 25F Airplanes |
Unsafe Condition
The stall warning systems may fail to activate prior to aerodynamic stall due to insufficient approach speeds or ice accumulation on wing leading edges, increasing the risk of uncommanded stall and loss of control.
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Required Actions
Temporarily insert specified stall warning system operational procedures into the Airplane Flight Manual, adjust the stall warning system per SB 24/25-294, and inspect related components within 300 hours time-in-service or by December 15, 1979. Compliance with paragraphs A7-A11 and B is voided if AAK 79-10A is installed.
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Compliance Time
Within 300 hours time-in-service after the effective date of this AD or December 15, 1979, whichever occurs first.
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Affected Aircraft
Learjet Model 24E, 24F, 24F-A, 25D, and 25F airplanes, including those with installed AAK 76-4 kit, as per specified serial number ranges.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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