AD 99-23-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 31 | Airworthiness Directives; Learjet Model 31, 31A, 35, 35A, and 60 Airplanes |
| aircraft | Learjet Inc. | 31A | Airworthiness Directives; Learjet Model 31, 31A, 35, 35A, and 60 Airplanes |
| aircraft | Learjet Inc. | 35 | Airworthiness Directives; Learjet Model 31, 31A, 35, 35A, and 60 Airplanes |
| aircraft | Learjet Inc. | 35A (C-21A) | Airworthiness Directives; Learjet Model 31, 31A, 35, 35A, and 60 Airplanes |
| aircraft | Learjet Inc. | 60 | Airworthiness Directives; Learjet Model 31, 31A, 35, 35A, and 60 Airplanes |
Unsafe Condition
Failure of the spoiler actuator piston rod due to an incomplete heat treatment process, which could result in the spoiler panel floating and inducing an uncommanded roll of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a visual inspection to determine the serial number of the spoiler actuators using specified service bulletins. Replace the spoiler actuators with new ones before further flight if the serial number is listed in the service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 150 flight hours after the effective date of this AD
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Affected Aircraft
Learjet Model 31, 31A, 35, 35A, and 60 airplanes with specific serial numbers 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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