WASHINGTON—The U.S. NTSB is recommending that Boeing redesign engine fan cowls on 737 NG-series airliners after finding that a fragmented fan blade compromised the structure on Southwest Airlines Flight 1380 in 2018, leading to the first fatality on a U.S. passenger airline in nearly a decade. In a probable cause finding released Nov. 19, the safety board traced the origin of the accident on Apr. 17, 2018 to a “low-cycle” fatigue crack in one of the fan blades of the ...

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