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United Airlines Boeing 777 returned to Denver International Airport shortly after takeoff when the right engined failed. Wochit

Investigations of aircraft accidents and incidents can take more than a year, but officials often get an early read on factors that may have played a role.

On Monday, two days after the high-profile engine failure on United Airlines Flight 328 from Denver to Honolulu, the National Transportation Safety Board held its first briefing on the incident, highlighting potential metal fatigue to an engine fan blade and documenting a “loud bang” heard on the cockpit voice recorder.

NTSB Chairman Robert Sumwalt provided details on how the in-flight emergency unfolded and offered preliminary findings.

The highlights

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