AD 2023-15-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Company | Airworthiness Directives; The Boeing Company Airplanes |
| engine | CFM | International | Airworthiness Directives; The Boeing Company Airplanes |
Unsafe Condition
Use of engine anti-ice (EAI) in dry air for more than five minutes during certain environmental and operational conditions can cause overheating of the engine inlet inner barrel beyond the material design limit, resulting in failure of the engine inlet inner barrel and severe engine inlet cowl damage.
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Required Actions
Revise the existing airplane flight manual (AFM) to limit the use of EAI in certain conditions. Revise the operator's existing minimum equipment list (MEL) to prohibit dispatch under Master Minimum Equipment List (MMEL) Item 30-21-01B (EAI valve locked open).
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Compliance Time
Within 50 flight hours after the effective date of this AD.
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Affected Aircraft
The Boeing Company Model 737 airplanes equipped with CFM International, S.A. (CFM) Model LEAP-1B series turbofan engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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