Years before F-22 pilots began getting dizzy in the cockpit -- before one struggled to breathe in advance of a fatal crash, before two more went on television to say they refused to fly it -- a small circle of U.S. Air Force experts knew something was wrong with the costly stealth fighter jet.Coughing among pilots and fears of contaminants in their breathing apparatus led the experts to suspect flaws in the oxygen-supply system of the F-22 Raptor, especially in extreme high-altitude conditions.
They formed a working group a decade ago to deal with the problem, creating a unique brain trust.
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