FARNBOROUGH — The blade rubbing that prompted a fire in an F-35A and led to a fleedwide grounding took place in the third-stage fan of the integrally bladed rotor (IBR) in the low-pressure section of the F135 engine, according to Lt. Gen. Christopher Bogdan, program executive officer for the U.S.–led F-35 program. The three-stage IBR sits behind the front fan in the F135 and compresses the air before passing it into the high-pressure core. Each stage is separated by a stator and ...

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