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  #1  
Old 01-07-2022, 09:47 PM
huse0054 huse0054 is offline
 
Join Date: Jul 2010
Location: Eagan, MN
Posts: 101
Default Emergency oxygen switch in panel

I have seen this on many panels with built-in oxygen systems. What is it for and what exactly does it do?
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  #2  
Old 01-08-2022, 06:28 AM
sailvi767 sailvi767 is offline
 
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In pressurized jet equipment it generally selects 100% oxygen under a constant flow with pressure. Pressure breathing is required at higher altitudes to maintain a functional oxygen level in the bloodstream.
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  #3  
Old 01-08-2022, 06:28 AM
RV10Pilot RV10Pilot is offline
 
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It is typically to bypass a pulse demand system and make it constant flow.
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  #4  
Old 01-08-2022, 07:24 AM
huse0054 huse0054 is offline
 
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Aha...thanks for the insight.
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  #5  
Old 01-08-2022, 12:09 PM
rongawer rongawer is offline
 
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Location: Brentwood, CA
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In my Mountain High Oxygen system, the emergency switch is a mechanical valve that connects the ports, that were setup for this, to a separate, direct oxygen hose. The assumption is that either the distributor modules failed somehow or some other normal path failure (hose rupture, power loss, etc). In emergency you have O2 directly from the bottle regulator.
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Last edited by rongawer : 01-08-2022 at 12:11 PM.
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  #6  
Old 01-08-2022, 06:37 PM
David Z David Z is offline
 
Join Date: Aug 2010
Location: Thunder Bay Ontario
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Depending on the set-up, constant flow oxygen option can also be used in conjunction with smoke goggles. The excess oxygen blows into the goggles to keep smoke away from the eyes.

Ever get campfire smoke in your eyes? I can't imagine trying to fly a plane with that going on.
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  #7  
Old 01-09-2022, 11:44 AM
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airguy airguy is offline
 
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I'm not entirely sure I would want my face to be the source of pure oxygen flowing in a fire environment producing smoke...
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  #8  
Old 01-09-2022, 11:53 AM
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Mike S Mike S is offline
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Quote:
Originally Posted by airguy View Post
I'm not entirely sure I would want my face to be the source of pure oxygen flowing in a fire environment producing smoke...
Yep, I thought the same thing.
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  #9  
Old 01-09-2022, 07:28 PM
David Z David Z is offline
 
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Location: Thunder Bay Ontario
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If there's smoke in the cockpit, it's a bad day. At least you'd be able to see without your eyes burning and watering uncontrollably. Hopefully the fire isn't near your face, and you'll have the ability to see, isolate and deal with source of the smoke.

Also remember not all smoke is from the EFIS exploding in your face. Could be a bad exhaust leak coming from the exhaust muff. Need to keep that smoke out of your eyes to be able to see the control to close the heat off.
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