>to Joan is that aviators are required to go to pure O2 at operational >altitudes (cabin pressures) above 12,500' MSL. I don't know of any Between 12500 and 14000 for longer than 30 minutes, flight crews are required to use O2. Above 14000 flight crews are always required to use O2. Above 15000 all crew and passengers are required to use O2. Altitudes are cabin altitude. ...Phil ...Caribbean Adventures
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