AD 87-02-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet Inc. | 35 | Airworthiness Directives; Gates Learjet Model 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 35A (C-21A) | Airworthiness Directives; Gates Learjet Model 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 36 | Airworthiness Directives; Gates Learjet Model 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 36A | Airworthiness Directives; Gates Learjet Model 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 55 | Airworthiness Directives; Gates Learjet Model 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 55B | Airworthiness Directives; Gates Learjet Model 35, 36 and 55 Series Airplanes |
| aircraft | Learjet Inc. | 55C | Airworthiness Directives; Gates Learjet Model 35, 36 and 55 Series Airplanes |
Unsafe Condition
Cracks in the forward engine mounts could result in loss of engine support and subsequent engine separation.
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Required Actions
Conduct a visual inspection of the forward engine mounts per SB 35/36-71-3 or 55-71-2. If cracks are found, replace with P/N 2651034 or conduct magnetic particle inspection. Submit compliance reports to FAA within one week.
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Compliance Time
Prior to the accumulation of 2,400 hours time-in-service or 2,400 landings (whichever occurs first), or within the next 75 hours time-in-service after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Gates Learjet Model 35 (serial 001-522), 36 (001-053), 55 (001-107), except those with P/N 2651034 forward engine mounts.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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