21 Sep 97 07:06, Don Burke wrote to Jay Hanig:
 DB> The limit on the other end is oxygen toxicity which occurs somewhere
 DB> between 15 psi and 30 psi, depending on the individual.
 DB> People have actually died from too much oxygen.
That isn't an option to people in an airliner...just not possible.  It is a 
real danger to a moron with scuba tanks who decides to set a new world depth 
record breathing compressed air.
 DB> If there is no compelling medical reason to go above about 3.5 psi
 DB> for an individual, the extra oxygen just boosts the fire hazard.
Nitrox mixtures could be safely used in aircraft that cruise in the teens or 
twenties.  With airliners cruising in the low to mid thirties though, it 
looks like they need every bit of 100% oxygen.
Jay
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