The effectiveness of required, routine inspection techniques are emerging as a key focus in the investigation of the April 17 CFM56-7B engine failure onboard a Southwest Airlines Boeing 737-700, the National Transportation Safety Board said in a May 3 update on the probe. The fan blades on the failed engine, including the fractured one, underwent detailed fluorescent penetrant and visual inspections as well as full overhauls in November 2012–10,700 cycles before the accident, ...

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