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Originally Posted by FOD I have always been under the impression that the oxygen requirements above 12,500 ("more then 30 minutes duration") is cumulative, but havent see it anywhere. Someone wanna clear this up for me? |
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§ 91.211 Supplemental oxygen.
(a) General. No person may operate a civil aircraft of U.S. registry—
(1) At cabin pressure altitudes above 12,500 feet (MSL) up to and including 14,000 feet (MSL) unless the required minimum flight crew is provided with and uses supplemental oxygen for that part of the flight at those altitudes that is of more than 30 minutes duration;
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Couldn't find any either, but it has always been my understanding that it is cumulative as well. If you are above 12,5 for 28 minutes and go below for a minute and then come back you only have 2 minutes left. That may be the extreme example, but that's the impression I was given during training.
Looking at the bolded, if you are on a flight of 2 hours, and go above 125 for 10 minutes and then back down, and then back up....you have 20 minutes, you are still on
that flight. Given that, I would say it is cumulative.
Bueller, Bueller??? Anyone????