Airworthiness Directive · Amendment 39-22517 · Ice and rain protection
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 737 airplanes equipped with CFM International, S.A. (CFM) Model LEAP-1B series turbofan engines, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737 airplanes equipped with CFM International, S.A. (CFM) Model LEAP-1B series turbofan engines. This AD was prompted by a report indicating that 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. This AD requires revising the existing airplane flight manual (AFM) to limit the use of EAI in certain conditions and revising the operator's existing minimum equipment list to prohibit dispatch under a certain item. The FAA is issuing this AD to address the unsafe condition on these products.
Within 15 days after the effective date of this AD: Revise the Limitations Section of the existing AFM to include the information specified in figure 1 to paragraph (g) of this AD. This may be done by inserting a copy of figure 1 to paragraph (g) of this AD into the existing AFM.
Within 15 days after the effective date of this AD or upon completion of the AFM revision required by paragraph (g) of this AD, whichever occurs first: Revise the operator's existing FAA-approved MEL to prohibit dispatch under the MEL item corresponding with Master Minimum Equipment List (MMEL) Item 30-21-01B (Engine (Cowl) Anti-Ice Valves).
