Quote:
Originally Posted by zapatista
]for ex low on oxygen an experienced pilot notices before blacking out and does something about it...
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Not true. You would not even notice that you were losing oxygen until it became far too late. I don't want to get into all the details right now, but do a quick search on hypoxia for more.
Besides the gauges for oxygen pressure and oxygen quantity, the pilot had to check his mask, and squeezed the tubing to make sure there was pressure and that no ice was forming.