Southwest engine fan blade showed signs consistent with metal fatigue: NTSB

Southwest engine fan blade showed signs consistent with metal fatigue: NTSBFederal investigators on Thursday said the engine fan blade that broke apart during a Southwest Airlines flight last month showed signs consistent with metal fatigue, as inspectors probe the first passenger fatality on a U.S. airline in nearly a decade. U.S. regulators this week broadened a directive to check the fan blades in hundreds of engines similar to the one that blew apart. The identification of metal fatigue, the degradation of a metal’s structural integrity over repeated use, could necessitate more frequent and more comprehensive inspections of these parts.



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