Faulty valve could contribute to hypoxia-like symptoms experienced by some pilots
The United States Air Force's premier air superiority fighter is the F-22 Raptor. However, the F-22 has had problems over the last few years with pilots at times experiencing hypoxia-like symptoms during flight. The F-22 fleet was grounded while an investigation into the problem was conducted.
Ultimately, USAF found no hard evidence on what was causing the symptoms in some pilots and the aircraft were returned to the skies with no fixes applied.
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