Boeing says preliminary investigations into the Aug. 27 in-flight shutdown of a CFM56-7B engine on an Alaska Airlines Boeing 737-700 indicate it was almost certainly a thrust instability event, most likely triggered by fuel contamination. The shutdown, which occurred after take-off on a flight from Los Angeles to Seattle, forced the crew to return for landing. If confirmed as another thrust instability occurrence, it would take the overall number of events caused by the same issue to ...

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