The U.S. Air Force is putting the F-22 back to work as of Sept. 21 with a new plan for making sure pilots have enough oxygen, Capitol Hill was told early Sept. 19. The Raptor fleet has been grounded since May 3 because pilots were showing symptoms of hypoxia. The Air Force Scientific Advisory Board investigating the problem has not pinpointed a “single, definitive root cause” of the symptoms, according to a release provided to Congress. Rather, investigators are looking at multiple ...


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