Pratt & Whitney aims by June to complete the investigation into the root cause of the turbine blade crack that temporarily grounded the F-35 Joint Strike Fighter fleet in February. Although the initial probe quickly identified thermal fatigue as the mechanism for the 0.6-in. crack in the third low-pressure turbine stage of an F-35A’s F135 engine, the specific cause of the creep damage remains unknown. While investigators know prolonged flight testing at high speed and low altitude ...


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