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I think the problem ends up with the F-22 that the problems aren't happening under the same circumstances and there is no trace of the problem once back on the ground, making it nearly impossible to trace.

Additionally, the OBOGS system is also used on the F-15E and F-16C/D Block 50+ aircraft, and they haven't been having the problem, so there is no clear reason why the F-22's are having issues.

If I am not mistaken, MSOGS (Molecular Sieve Oxygen Generating System) as used on the F-15E and OBOGS as used on the F-16 and (presumably) the F-22 operate in a completely different manner. I am reasonably familiar with MSOGS since I worked on the F-15E, but not so much with OBOGS, so someone may be able to tell me if they are the same.

Author:	wendovertom [ Thu May 03, 2012 10:26 am ]
Post subject:	F-22 problems
I caught a little bit of the story on Night Line - what made me smile was Sen. McCain's comment to the question of "What will the Air Force use the F-22 for?" He responded by dryly saying, "There are a lot of air shows that would love to see the Raptor". I was under the impression that the OBOGS issue was resolved but this report made it sound like the Raptor still has issues and is a maintnance hog and pilots are still pretty nervous about the life support system. Tom P.

Author:	muddyboots [ Thu May 03, 2012 12:04 pm ]
Post subject:	Re: F-22 problems
Last I heard there were pilots asking not to fly it. Can you imagine? The newest hottest bird out there and pilots are scared to get in it. And considering most fighter pilots attitudes, that says a lot about the aircraft.

Author:	The Inspector [ Thu May 03, 2012 12:15 pm ]
Post subject:	Re: F-22 problems
According to an article in this mornings birdcage liner, it still involves the 02 supply reliability issue.

Author:	skymstr02 [ Fri May 04, 2012 5:05 am ]
Post subject:	Re: F-22 problems
There have been 19 incidents of pilot hypoxia since the aircraft was cleared for flight status after the investigations that revealed no cause.

Author:	CAPFlyer [ Sun May 06, 2012 2:57 pm ]
Post subject:	Re: F-22 problems
I think the problem ends up with the F-22 that the problems aren't happening under the same circumstances and there is no trace of the problem once back on the ground, making it nearly impossible to trace. Additionally, the OBOGS system is also used on the F-15E and F-16C/D Block 50+ aircraft, and they haven't been having the problem, so there is no clear reason why the F-22's are having issues. I think eventually someone will figure it out, but as long as the pilots are aware of the issue and transfer to the backup system when symptoms onset, the impact will be minimal and will allow the guys to at least keep flying. The thing that makes me go "hmmm" on this thing is that considering how many hours the first production aircraft were flown at Edwards and Eglin, why didn't it crop up until after almost all the planes were delivered and on airframes that had significantly fewer hours than other identical aircraft that'd been flown much more strenuously than those?

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Author:	Kyleb [ Sun May 06, 2012 5:59 pm ]
Post subject:	Re: F-22 problems
CAPFlyer wrote: I think the problem ends up with the F-22 that the problems aren't happening under the same circumstances and there is no trace of the problem once back on the ground, making it nearly impossible to trace. Intermittant problems are the devil's work. VERY hard to diagnose.

Author:	eagle21 [ Sun May 06, 2012 10:41 pm ]
Post subject:	Re: F-22 problems
CAPFlyer wrote: Additionally, the OBOGS system is also used on the F-15E and F-16C/D Block 50+ aircraft, and they haven't been having the problem, so there is no clear reason why the F-22's are having issues. If I am not mistaken, MSOGS (Molecular Sieve Oxygen Generating System) as used on the F-15E and OBOGS as used on the F-16 and (presumably) the F-22 operate in a completely different manner. I am reasonably familiar with MSOGS since I worked on the F-15E, but not so much with OBOGS, so someone may be able to tell me if they are the same. However, that still does beg the question, "Why does OBOGS work so well on the various models of the F-16 and apparently not so well on the F-22? What engineering change occurred in the different aircraft?" John

Author:	muddyboots [ Sun May 06, 2012 11:56 pm ]
Post subject:	Re: F-22 problems
The problem probably occurred when they introduced the twelve pound lead plug into the air line.

Author:	CAPFlyer [ Mon May 07, 2012 2:46 pm ]
Post subject:	Re: F-22 problems
eagle21 wrote: If I am not mistaken, MSOGS (Molecular Sieve Oxygen Generating System) as used on the F-15E and OBOGS as used on the F-16 and (presumably) the F-22 operate in a completely different manner. I am reasonably familiar with MSOGS since I worked on the F-15E, but not so much with OBOGS, so someone may be able to tell me if they are the same. While they may be different in some ways, from what Cobham shows, it looks like the delivery is essentially the same, just how the oxygen is stored is different. Here's a list of all their installations: http://www.cobham.com/about-cobham/miss ... gs%29.aspx

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