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Date: Sun, 13 Jan 2013 02:28:10 -0500
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From: "Dennis Johnson" <pinetownd@volcano.net>
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Subject: Re: [LML] Re: LML roots
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----- Original Message ----- 
From: "Bill Wade" <super_chipmunk@roadrunner.com>
To: <lml@lancaironline.net>
Sent: Saturday, January 12, 2013 10:17 AM
Subject: [LML] Re: LML roots


>I agree. I've never used an oxygen system before but would like to install 
>an emergency system in the IV-P I'm building. For starters, if there was a 
>rapid decompression at altitude how quickly can a system be activated? Mask 
>or cannula- should they be worn around your neck and plugged in just in 
>case? Flow adjustments- I don't know enough yet to even ask intelligent 
>questions. Thanks- Bill Wade
>

Hi Bill,

Here's a good chart for the "time of useful consciousness," which is how 
long you can expect to be functional without supplemental oxygen at various 
altitudes.

http://en.wikipedia.org/wiki/Time_of_Useful_Consciousness

A rapid decompression reduces the times shown in the table by about half. 
If you are at flight level 250 and have a rapid or explosive decompression, 
you have maybe three minutes or a little more to get below 10,000'.  If 
you're in the mountains, in IMC, you might not be able to rapidly descend 
below 15,000'.

I don't have the benefit of pressurization in my Legacy, but if I did, I 
would have oxygen immediately available when flying in the flight levels. 
And I really do mean immediately.

Dennis
Legacy 560 hours