A US National Transportation Safety Bureau (NTSB) investigative hearing into the April inflight engine failure of a Southwest Airlines Boeing 737-700 on Nov. 14 honed in on the design and testing of the CFM56-7B engine fan blades and the containment capability of the engine inlet and fan cowl. Questioning representatives of Boeing and engine manufacturer CFM International, NTSB investigators compared the April accident to an engine failure on a Southwest 737-700 in August 2016. Both were ...

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