ALBUQUERQUE, NM (KOAT/KYW/CNN) – The National Transportation Safety Board said metal fatigue is what caused a fan blade on Southwest Airlines Flight 1380 to break off and get caught in the engine.
That's what eventually led to the window breaking in mid-flight on April 17, killing one of the passengers.
Investigators said the fan blade broke into two pieces and became stuck in the engine, causing a domino effect that resulted in the rare tragedy.
Metal experts are investigating what caused the fan blade to wear out.
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