Investigators have narrowed their focus to the third stage turbine of the F135 engine as the likely source of a fire that erupted June 23 as an F-35A fighter was preparing for takeoff at Eglin AFB, Florida, last month.  The June 23 fire, which occurred at 9:15 a.m. local time, first prompted “safety pauses” to flights for the fleet directed by local commanders, followed by a more serious fleetwide grounding order issued the evening of July 3, just before the U.S. ...


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