Boeing says a preliminary investigation of a Aug. 27 inflight shutdown of a CFM International CFM56-7B engine on an Alaska Airlines Boeing 737-700 indicates 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 International Airport to Seattle–Tacoma International Airport, forced the crew to return to Los Angeles. If confirmed as another thrust instability occurrence, ...

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