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Date: Mon, 11 Sep 2006 11:05:35 -0400
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From: Lorn H Olsen <lorn@dynacomm.ws>
Subject: Re: High Altitude Oxygen Failure

Steve,

When you say 18,000 ft, do you mean pressure altitude, density  
altitude or actual altitude above MSL? I think that you are being to  
picky about the exact altitude to switch masks at.

I have had my Mountain High (MH) EDS for about 4 years now and never  
had a failure. Well almost never. Whoops..., one time I bumped the on  
switch and the battery was dead.

Back when I first started using the MH EDS, I, like you, was curious  
about how high I could use the cannula. I talked to someone at MH and  
they said that they had used the cannula without any problem to, if I  
remember correctly, 35,000 ft. I do believe that it is an FAA  
regulation that requires the switch to a face mask at 18,000 ft.  
Todays MH system with the EDS should be OK for a little over 18,000  
ft. After all, 19,000 ft is not like you are going to 35,000 ft.  
Remember you are running a normally aspirated engine not TCed.

Remember also that the MH EDS also has the ability to give you a  
little more O2 if you need it with the +5K, +10K and +15K settings.

> .
> .
> The system was working great up to 18,000 ft.  Now I have to admit,  
> I was using the cannula and didn't initially plan on going above  
> 18000 ft.  However, I did have the face mask with me which you're  
> supposed to use at 18000 and above. Yes, the instructions say the  
> mask must be used at 18000.
> .
> .
> Steve Rosenzweig
> LNC 360 MK II
> N171DK
> Lancaster, CA
--
Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp.
248-345-0500, mailto:lorn@dynacomm.ws
LNC2, O-320-D1F, 1,200 hrs, N31161, Y47, SE Michigan