AD 86-22-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 23 | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24 | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24A | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24B | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24B-A | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24C | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24D | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24D-A | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24E | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 24F | Airworthiness Directives; Gates Learjet Model 23, 24, 25, 28, 29, 35, 36 and 55 Series Airplanes |
Unsafe Condition
Flap sector upper mount bracket failures could cause impairment of flap operation, an asymmetric flap condition, false gear warning horn signals, or incorrect biasing of the stall warning system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 50 hours time-in-service after the AD's effective date, inspect flap sector upper mounting brackets for cracks per AMK 86-4 or 55-86-2. If cracks found, replace both brackets and install stiffeners before further flight. If no cracks, replace brackets and install stiffeners within 100 hours time-in-service after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Gates Learjet Models 23 (serial 003-099), 24 (100-357), 25 (003-373), 28 (001-005), 29 (001-004), 35 (002-545, 589-598), 36 (001-053, 055), 55 (001-121) as listed in the AD, if equipped with dual flap actuators for Model 23 serial 003-089.
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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