WASHINGTON—Maintenance records from the Southwest Airlines Boeing 737-700 that experienced an inflight engine failure last month reveal the fan blades of its CFM56-7B turbofan engines, which are suspected of causing the failure, had been overhauled 10,712 engine cycles before the accident, the National Transportation Safety Board (NTSB) reported. In an investigative update released on May 3, the NTSB said the fan blades were last overhauled in November 2012, at which time they were ...

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