What are the three 3 altitudes in regards to supplemental oxygen and who is required to have it at each?

Sea Level to 12,500' - No oxygen required. 12,501' to 14,000' - Required by the required crew if over 30 minutes at this altitude. 14,001' to 15,000' - Required to be provided and used by the required flight crew.



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For best protection, you are encouraged to use supplemental oxygen above 10,000 feet MSL. At night, because vision is particularly sensitive to diminished oxygen, a prudent rule is to use supplemental oxygen when flying above 6,000 feet MSL. So, when you fly at high altitudes, supplemental oxygen is the only solution.

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There are three components to most oxygen systems, whether they are portable or installed systems. Oxygen can be stored in the aircraft as a gas, liquid, or a solid.

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For Part 91 General Aviation operations the required flight crew must use supplemental oxygen for any portion of the flight that exceeds 30 minutes above a cabin pressure altitude of 12,500 feet mean sea level (MSL) up to and including 14,000 feet (MSL).

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For Part 91 General Aviation operations the required flight crew must use supplemental oxygen for any portion of the flight that exceeds 30 minutes above a cabin pressure altitude of 12,500 feet mean sea level (MSL) up to and including 14,000 feet (MSL).

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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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For best protection, you are encouraged to use supplemental oxygen above 10,000 feet MSL. At night, because vision is particularly sensitive to diminished oxygen, a prudent rule is to use supplemental oxygen when flying above 6,000 feet MSL. So, when you fly at high altitudes, supplemental oxygen is the only solution.

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The general rule is that planes should have cabin pressurization when they go above 10,000 to 14,000 feet. Can a pilot depressurize a cabin? Most aircraft cabins are pressurized to an altitude of 8,000 feet, called cabin altitude.

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