According to the newly-released accident investigation board report, the cause wasn't the onboard oxygen generation system (OBOGS), although it did stop working. Instead, the pilot apparently struggled to activate the back-up oxygen system so much he inadvertently flipped the F-22 over into a steep dive while contorting his body to pull the tiny ring tucked into the side of his ejection seat.
Stephen Trimble Washington DC
A US Air Force report says the regular oxygen system stopped working before a fatal Lockheed Martin F-22 crash in Alaska last November.
The accident investigation board still blames the accident on the pilot, Captain Jeffrey Haney, who failed to activate an emergency oxygen supply that could have saved his life and the aircraft.
But the failure of an engine bleed air system that feeds the Honeywell onboard oxygen generation system (OBOGS) in the moments before the crash is a new twist in the evolving story.
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