AD 80-19-11 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24A | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24B | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24B-A | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24C | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24D | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24D-A | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Gates Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 35, 36, 35A and 36A Series Airplanes |
Unsafe Condition
Failure to properly adjust automatic flight control and stall warning systems and adhere to operational limitations could result in undetected system failures, runaway trim, high speeds, severe buffet, wing roll off, structural overload, and difficult recovery. Improper adjustment of capstan slip clutches and stall warning systems may impair manual override capability and stall warning functionality.
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Required Actions
Insert specific operational limitations and procedures into the Airplane Flight Manual, conduct inspections and adjustments of automatic flight control system capstan slip clutches within specified flight hour limits, perform stall warning accelerometer inspections, submit reports of discrepancies, incorporate specific modification kits by October 1, 1986, and obtain equivalent compliance approval if required.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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