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01-07-2022, 09:47 PM
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Join Date: Jul 2010
Location: Eagan, MN
Posts: 101
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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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01-08-2022, 06:28 AM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,450
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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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RV-6 sold
F-1 Rocket
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01-08-2022, 06:28 AM
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Join Date: Jan 2005
Location: Medford, NJ USA
Posts: 519
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It is typically to bypass a pulse demand system and make it constant flow.
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01-08-2022, 07:24 AM
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Join Date: Jul 2010
Location: Eagan, MN
Posts: 101
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Aha...thanks for the insight.
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01-08-2022, 12:09 PM
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Join Date: Dec 2007
Location: Brentwood, CA
Posts: 912
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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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Ron Gawer
- RV10, N762G, Build in progress.
- Several others that are now just great memories for me.
Last edited by rongawer : 01-08-2022 at 12:11 PM.
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01-08-2022, 06:37 PM
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Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 891
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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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RV8
Empennage Passed Pre-close Inspection
Wings mostly done
Fuselage assembly, it's a riveting job!
83126
Dash 8 day job is financing the RV8
Donation till September 2022
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01-09-2022, 11:44 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,816
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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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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2022 dues paid 
N16GN flying 1,000 hrs and counting on 91E10; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
Pending Repeat Offender - 10 kit is on order. TDI? Turbine? Stay tuned! 
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01-09-2022, 11:53 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,318
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Quote:
Originally Posted by airguy
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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Yep, I thought the same thing.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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01-09-2022, 07:28 PM
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Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 891
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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.
__________________
RV8
Empennage Passed Pre-close Inspection
Wings mostly done
Fuselage assembly, it's a riveting job!
83126
Dash 8 day job is financing the RV8
Donation till September 2022
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