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Yes adding concentration gets around the pressure issue at the expense of making everything a blowtorch if accidentally ignited. My non pressurized plane could have a aux O2 pressure system, but the pricing and required training was prohibitive and it didn't work on the 2 year old in the back seat. Ditto for typical.passengers: do you know the symptoms of impending hypoxia?
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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