The U.S. Air Force will continue to investigate the oxygen concentration levels in F-22 Raptor cockpits in the wake of reports about fluctuations of those numbers noted during studies of recent pilot breathing problems. “We also will study and as necessary revise the schedule by which the Obogs (On-Board Oxygen Generation System) adjusts the oxygen concentration delivered to the pilot to better mitigate against the identified effects of too low or too high a concentration,” says service ...


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