Pratt & Whitney says flutter has been ruled out as an early cause of the F135 fan failure that developed in the first stage of the Joint Strike Fighter engine's three-stage unit during ground tests in Florida on Dec. 23. The fan crack occurred during accelerated mission tests on ground engine FX648 at Pratt's West Palm Beach facility as the engine reached 77% of its required life, says the F-35 program executive officer, Lt. Gen. Christopher Bogdan. Pratt may have “underestimated the ...

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