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Flight restrictions lifted for F-22 fighters equipped with new automatic oxygen backup system

The United States Air Force’s F-22 Raptor air superiority fighters have been the subject of flight restrictions since May of 2012. These flight restrictions were part of a response to hypoxia-like symptoms some pilots experienced during flights.

The United States Air Force had expected a fix for the onboard oxygen generator, which is suspected to be part of the problem causing the hypoxia-like symptoms in some pilots, by the end of 2012. This led to flight restrictions being placed on F-22 fighters that limited them to operation within 30 miles of a safe landing area.

The United States Air Force Air Combat Command announced this week that those restrictions mandated by former Defense Secretary Leon Panetta in May of 2012 have finally been lifted. The affected F-22s have been retrofitted with an automatic backup oxygen system instead of the previous manual system. The Air Force expects the new oxygen system to be installed on all F-22 fighters by July 2014.
fatal F-22 crash in Alaska in November 2010 occurred after the pilot was unable to activate the manual backup oxygen system. In that fatal accident the Air Force ruled that while the onboard oxygen generation system in the Raptor had failed, pilot error was the ultimate cause of the crash because of the pilot's inability to activate the backup oxygen system.

Last July, investigators announced that the primary cause of these hypoxia symptoms was a leaky valve in the Combat Edge life-support vest. The investigators said that the leaking valve caused the vest to inflate unnecessarily at lower altitudes, restricting the pilot's ability to breathe. Those problematic valves were replaced in January.

Source: Defense News

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By laweijfmvo on 4/5/2013 10:48:33 AM , Rating: 5
the timing has nothing to do with the idea that the u.s. may want to use these jets if the situation in north korea worsens.

RE: coincidence
By FaaR on 4/5/2013 11:09:22 AM , Rating: 5
Purely a coincidence, yes.

RE: coincidence
By Cypherdude1 on 4/6/2013 4:25:21 PM , Rating: 2
I sure hope they know what they're doing. The F-22 is very expensive. At $356,684,491.979 a copy, every time they lose one, it seriously hurts the Defense budget:
Program cost: US$66.7 billion/187 operational aircraft=
$356,684,491 & 98¢

RE: coincidence
By MADAOO7 on 4/8/2013 4:53:56 PM , Rating: 2
You're math isn't correct. First off, production ended in 2011 on the F-22, so if you lose one, you lose one. We can no longer replace them at any cost.

When they were being built, they did not cost $356 million a copy. The program as a whole has cost north of $74 billion to date. With that said, much of that is a sunk cost for R&D. The actual unit cost for the last 60 F-22's made was $137 million.

RE: coincidence
By MADAOO7 on 4/8/2013 4:55:33 PM , Rating: 2
Meant "Your math is not correct."

RE: coincidence
By Yofa on 4/5/13, Rating: -1
RE: coincidence
By MechanicalTechie on 4/7/13, Rating: 0
RE: coincidence
By Nfarce on 4/7/2013 8:37:18 PM , Rating: 2
Only one ape has been chest thumping there you brainiacs, and that's the fat little troglodyte running North Korea. They want a unified Korea, communist-dictatorship DPRK style (and I always have to laugh with those freaks saying "democratic" in most of their titles on everything of importance and power).

They've already shelled a South Korean island, sunk a South Korean Navy ship, and launched missiles over Japan. They want war. It's about time we give them what they have been asking for once and for all. Shut those unicorn-worshipping freaks the hell up once and for all.

RE: coincidence
By MechanicalTechie on 4/7/2013 9:54:39 PM , Rating: 1
You are aware that chest beating is NOT a mutually exclusive affair. I think 99.9% of people would agree that the leaders of N.K are tapped in the head but pushing for a war is not the answer.
The deep mistrust and the overwhelming forces against N.K makes them overact. Let them run their country into the ground, they know if they attack S.K, U.S or Japan its game over. Best thing to do is not provoke with massive miltary games on their front door.

RE: coincidence
By Reclaimer77 on 4/7/2013 11:38:51 PM , Rating: 2
Amazing how history repeats itself due to thinking like this.

No offense of course but every time that's been tried, leaving despots and dictators alone in the naive hope everything will be okay, it has failed.

Categorizing what the US has done as some kind of escalation, after being directly threatened and told in no uncertain terms "we WILL nuke you", is laughable. Are you serious?

but pushing for a war is not the answer.

Like it or not it's the only answer North Korea is pushing us into.

RE: coincidence
By MechanicalTechie on 4/8/2013 1:56:21 AM , Rating: 2
Their is a difference between installing anti-missile defence systems and flying B2 bombers across the pacific in a mock exercise to bomb the country.

N.K is fully aware of the nuclear deterrence of the US and sending the bomber over was nothing more than a provocative act.

Much better to not scoop to N.K level.. only doing so will encourage mistrust.

RE: coincidence
By ianweck on 4/8/2013 4:12:17 PM , Rating: 2
We've been not "scooping" for over 50 years.

RE: coincidence
By Reclaimer77 on 4/8/2013 9:39:13 PM , Rating: 1

RE: coincidence
By MechanicalTechie on 4/9/2013 2:27:28 AM , Rating: 2
Wrong? Seems like your getting too many of your 'facts' from Fox News.

RE: coincidence
By Manch on 4/9/2013 4:21:38 AM , Rating: 2
and where do you get your "facts"?

Here's the thing. NK has escalated by threatening the use of nukes and invasion. SK has no tactical nukes, but they are under the protection of our Nuclear Umbrella. The B2 is part of our nuclear deterrence and the purpose of the fly over is to let them know in a very real way that we can reach out and touch them from anywhere. We also have an agreement w/ SK that if NK invades we will be standing right beside them to repel the attack and defeat NK. This has been this way since the armistice and is nothing new. We're not escalating anything. If anything NK has escalated in recent years with missile tests, shelling a SK island killing SK Marines, civilians, and sinking one of there ships. We have to make it known in a very real way that we are prepared to counter anything they may attempt.

RE: coincidence
By MattCoz on 4/5/2013 12:26:34 PM , Rating: 5
Add to that the re-release of Jurassic Park today. I like to imagine Kim Jong-un as the kid at the dig site.

"That's when the attack comes. Not from the front, but from the side, from the two Raptors you didn't even know were there."

RE: coincidence
By synapse46 on 4/5/2013 1:10:42 PM , Rating: 3
Curious what they use these for anyways, besides flybys at airshows.

RE: coincidence
By Kazinji on 4/6/2013 8:09:34 AM , Rating: 2
F-22 Raptor is the replacement for the F-15 Eagle. F-15 Eagle is US Air to Air combat plane. It's sole purpose is air combat, F-15 has shot down 200+ planes without losing any. Pretty sure the F-15 and F-22 are US only planes. Unlike the F-35 Lightning multipurpose plane, which has many countries involved in develop and purchasing planes.

RE: coincidence
By Jedi2155 on 4/6/2013 5:35:45 PM , Rating: 2
The F-15 are available in a multitude of other countries:


and the F15E is available in:

South Korea
Saudi Arabia

RE: coincidence
By Nfarce on 4/7/2013 8:44:06 PM , Rating: 2
Thank you. I was about to post that. Also, Japan builds their own F-15s under license, called the F-15J. Not sure about other nations.

RE: coincidence
By Manch on 4/8/2013 6:22:44 AM , Rating: 2
Aside from some Japan specific avionics, the J's are equivalent to our A's. Made by Mitsubishi tho. Also check out their F2's Looks like an F16, but it's a bit different. Honestly you wouldn't notice the difference unless they were sitting side by side, or you heard them taking off. The F2's are LOUD!

"The Space Elevator will be built about 50 years after everyone stops laughing" -- Sir Arthur C. Clarke

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