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Brent,

I'm assuming that you are speaking about there being no difference between
compressed air breathed from a bottle with a regulator at FL240 being no
different than breathing ambient air at FL240 with some authority.  You may
very well know better than I.......cause I don't know for sure.

I know in scuba when one is breathing with a regulator at 2 or 3 atmoshperes
the air coming out of the tank keeps your lung pressure the same as when you
left the surface.  That's why you never hold your breath while scuba diving
and ascending.....your lungs could explode.  I assume that the opposite
would be true if at FL240 and breathing through a regulator.  If the
compressed air breathing were started at FL240 and a descent was made the
air would remain as if you were still at FL240 until you stopped breathing
with the regulator.

I for one would never use anything other than an O2 system designed for
aviation.  The risk of using Nitrox mixes, compressed air or anything other
than aviation approved products is way too high unless one is well schooled
in that area and knows what they are doing.

On another note in the same stanza, using any gas mixture in a bottle other
than what the bottle was designed for is VERY, VERY dangerous to say the
least.

There was another thread here that mentioned moving the 320/360 hydraulic
power pack behind the seats.  This could be very dangerous also because any
mixture of pure O2 and any petroleum product is extremely flammable.  I have
visions of being on O2 when a hydraulic pump or line fails and shoots
hydraulic fluid all over the place.  It could get very warm.

Curtis

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