Pilots are concerned about developing cases of hypoxia, symptoms such as nausea and blackouts resulting from a lack of oxygen while flying the F-22. Last year, this very concern grounded the F-22 last year for five months.
They returned to service when the Air force did not find the root of the problem. Below see the clip on sixty minutes where pilots declared that they were refusing to fly the aircraft because of oxygen deprivation in the cockpit. A Virginia Air National Guard pilot in the video below admitted that he developed hypoxia on a Febuary training flight and consequently recovered in a hyperbaric chamber.

The post Hypoxia on F-22 first appeared on George Hatcher's Air Flight Disaster.