AD 2007-17-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Learjet | 31 | Airworthiness Directives; Learjet Model 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C Airplanes, and Model 45 Airplanes |
Unsafe Condition
Unsealed gaps (penetration points) of the engine firewall were discovered during production, which could allow penetration of flammable liquids or fire through the engine firewall into the engine pylon, leading to fire inside the airplane.
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Required Actions
Inspect for unsealed gaps on the pylon side of the engine firewall and clean/seal any unsealed gap. For Learjet Model 45 airplanes only, inspect the engine pylon trailing edge for unsealed gaps and clean/seal any unsealed gap.
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Compliance Time
Within 12 months after the effective date of this AD.
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Affected Aircraft
Learjet Model 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C airplanes, and Model 45 airplanes; certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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