Raisuli Posted November 25, 2018 Posted November 25, 2018 ...or PEBKAC. I'm sure it's far more likely I'm pulling G in the hanger. In a cold and dark airplane. Because I'm old and out of shape and my G tolerance is down to...less than 1? Just got all my button boxen set up. That's the only clue I have. Start a mission, cold and dark (well, daylight) in a hanger. At Tonopah, which is more secure than Groom Lake. O2 flow on, OBOGS on, canopy open. Vision gets blurry, desaturates, tunnel vision...the whole smash until all goes black. No idea why. Anyone have any ideas? I'm about to unplug the boxen and MFDs and see if it's a controller issue, but...
jonsky7 Posted November 25, 2018 Posted November 25, 2018 (edited) Does oxygen flow without electrical power? I'm not sure but I think OBOGS stands for On Board Oxygen Generator System, which would lead me to think that it's not a bottle of oxygen but rather a system that filters nitrogen out of the air to increase oxygen content. Airliners use a system like this but the other way around. As nitrogen molecules are a lot smaller than oxygen ones, you can use a special filter to separate them, but you need airflow (provided by a fan) for it to work. the oxygen is dumped overboard and the nitrogen enriched air is fed into the fuel tanks to reduce explosive vapour content in the fuel tanks. Reading other posts, it seems like your oxygen mask is permanently on your face, and so without the system running you're limiting your supply of breathing air. Edited November 25, 2018 by jonsky7
mahuja Posted November 25, 2018 Posted November 25, 2018 This looks like you turned -down- the O2 flow. It starts at max, and if you move it down you get hypoxia no matter the circumstances. In particular, the obogs system switch, power, or the fact that you're at ground level where you'd take your mask off, doesn't matter. And last time someone reported it they filed it under "working as intended".
Raisuli Posted November 25, 2018 Author Posted November 25, 2018 This looks like you turned -down- the O2 flow. It starts at max, and if you move it down you get hypoxia no matter the circumstances. That's the bizarre bit. I checked. O2 at max. Hopped in an F5...could sit around all day (also at Tonopah, so it's not some kind of space alien thing going on). Unmapped the O2 axis...everything is fine. It's probably a trap for idiots dumb enough to put so many axis on their switch boxen then end up with silliness like "Left vent louver" or "O2 Flow". Ok, I didn't map the left vent, but still... I'm calling it a bug and sending a nastygram to McDonnell Douglas.
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