Air Force investigators are looking into whether engine startup procedures for F-22 Raptor jets at Joint Base Elmendorf-Richardson could be responsible for reports of hypoxia related to the stealth fighters' oxygen-supply system.According to the Air Force Times, most of the hypoxia incidents have occurred at JBER, where F-22s are often started up inside hangars due to harsh weather outside.
Investigators believe carbon monoxide generated by the Raptors’ own jet engines could be getting ingested back into the engines’ bleed air intakes.
Those intakes supply the on-board oxygen generation system, or OBOGS, which provides oxygen to the pilot.
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