What are Part 121 oxygen requirements?

The required two hours supply is that quantity of oxygen necessary for a constant rate of descent from the airplane's maximum certificated operating altitude to 10,000 feet in ten minutes and followed by 110 minutes at 10,000 feet.



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There are three standard types of aviation oxygen systems:
  • Continuous flow: For aircraft that fly under 25,000 feet or utilize a portable oxygen supply.
  • Diluter demand: Meant for flight between 25,000 and 40,000 feet high.
  • Pressure demand: Systems for aviation at over 40,000 feet.


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