A 0.6-in. crack found on a blade in the third-stage low-pressure turbine of an F-35A last month was the result of “thermal creep,” says U.S. Air Force Lt. Gen. Christopher Bogdan, F-35 program executive officer. Though the problem is not thought to be a design flaw in the F135 engine, the Pratt & Whitney propulsion system is “not out of the woods” yet as officials study what implications there could be for durability of the system once it is fielded, Bogdan told an audience March 5 ...


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