AD 2004-03-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet | 31 | Airworthiness Directives; Learjet Model 31, 31A, 35, 35A (C-21A), 36, and 36A Airplanes |
Unsafe Condition
Cracks in the shear webs of the forward engine beams could lead to significant structural damage to the engine pylons and possible engine separation from the fuselage, resulting in reduced controllability of the airplane.
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Required Actions
Modify the drag angles of the fuselage and engine pylons to gain access to the shear webs of the forward engine beams. Perform repetitive inspections of the shear webs for cracks. Modify or repair the shear webs as necessary, which will terminate the repetitive inspections.
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Compliance Time
Before further flight
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Affected Aircraft
Learjet Model 31, 31A, 35, 35A (C-21A), 36, and 36A airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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