The chairman of the National Transportation Safety Board said a preliminary assessment has revealed that damage to a fan blade in the engine that failed on a United Airlines Boeing 777-200 is consistent with metal fatigue.

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The Pratt & Whitney PW4000 engine failed with a “loud bang” four minutes after takeoff off Saturday from Denver, causing minor damage to the fuselage, NTSB Chairman Robert Sumwalt told reporters Monday after an initial analysis of the flight data and cockpit voice recorders.

Read more at NY Post.