Strategy Page has an update on the F-22 and the ongoing investigation into air supply problems for the pilot:
The U.S. Air Force is admitting that it is having a problem with the pilot air supply on the F-22, a problem they have not been able to find the cause of. Despite this, the air force is going to continue flying its F-22s. The decision to keep flying was made because the air supply problems have not killed anyone yet and they are rare (once every 10,000 sorties.)
The 14 incidents so far were all cases of F-22 pilots apparently experiencing problems. The term “apparently” is appropriate because the pilots did not black out and a thorough check of the air supply system and the aircraft found nothing wrong. There have been nearly 30 of these “dizziness or disorientation” incidents in the last four years, with 14 of them serious enough to be called real incidents. Only one F-22 has been lost to an accident so far and, while that did involve an air supply issue, it was caused by pilot error, not equipment failure.
Meanwhile the air force is spending $7 million to install commercial oxygen status sensors in the air supply systems of its F-22 fighters. This is part of a year-long effort to find out what’s causing the air supply on F-22s to get contaminated and cause pilots to become disoriented or pass out. Twice in the past year the entire F-22 fleet was grounded because of the air supply problems. The first grounding lasted 140 days and ended last September. The second grounding lasted a week and ended five months ago. The 180 F-22s comprise the most powerful component of the air force’s air combat capability and the brass are eager to find out what is wrong.
