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Fatal problems plague the costly F-22 Raptor fighter jet
Even before the fatal Alaska crash, there were numerous complaints from pilots that the jet’s oxygen systems weren’t feeding them enough air — which caused wooziness in flight. Because of this, the entire fleet of F-22s was grounded for nearly five months beginning in May. But even after the grounding was lifted, investigators still had no answers as to why the malfunctions occurred.
Previous oxygen systems in fighter jets used a separate bottle that fed air to pilots. In an F-22, the air intake system uses air from the jet engine’s compressor section to supply oxygen for pilots.
Pratt and Whitney F119 Engines
Another advantage of the bypass air is that it greatly adds to the oxygen content in the jet pipe, which provides a distinct advantage over a basic turbojet: when the afterburner (or augmeter) is introduced, the fuel has a lot more oxygen to mix with which means that the afterburner can provide an even more substantial thrust boost.
let's get some facts straight.
Also these pilots are not used to flying 60,000 ft in the sky, that could be another reason
The fact that the mechanics are getting sick as well leads me to believe it's the paint or something with the fumes.
It’s also our opinion that it’s unacceptable that neither the U.S. Air Force nor any of the F-22′s manufacturer’s can give a definitive answer on both the root cause of the oxygen system failure (bleed air intake system malfunction?) Source: DefenseReview.com (s.tt...)
Another advantage of the bypass air is that it greatly adds to the oxygen content in the jet pipe, which provides a distinct advantage over a basic turbojet.
Pratt and Whitney Engine Specs/Info
Hypoxia (medical) Wiki
Hypoxia, or hypoxiation, is a pathological condition in which the body as a whole (generalized hypoxia) or a region of the body (tissue hypoxia) is deprived of adequate oxygen supply
It is possible to experience hypoxia and have a low oxygen content (e.g., due to anemia) but maintain high oxygen partial pressure (pO2). Incorrect use of these terms can easily lead to confusion, especially as hypoxemia is among the causes of hypoxia (in hypoxemic hypoxia)
The JSF, the Lockheed Martin F-35 Lightning II, is being developed as a fifth-generation, stealthy, multi-role fighter for the US and UK armed forces and allies.
Joining the international JSF program enables Australia to access capability and technology a generation ahead of other contemporary aircraft.
It is very unlikely that Australia will purchase the Lockheed Martin F-22 Raptor, as proposed by some commentators. The F-22 Raptor cannot perform the strike or close air support roles planned for the JSF
Source: RAF - Defence Australia