What are the oxygen requirements when operating at cabin pressure altitudes above 15000 feet MSL?

(ii) Above 15,000 feet MSL, oxygen to each occupant of the aircraft, other than the pilots, for one hour unless, at all times during flight above that altitude, the aircraft can safely descend to 15,000 feet MSL within four minutes, in which case only a 30-minute supply is required.



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Above 12,000 feet MSL each member of the flight deck crew must use supplemental oxygen during the entire portion of the flight at those altitudes (14 CFR § 135.89, § 135.157, § 121.327, & § 121.329). For best protection, you are encouraged to use supplemental oxygen above 10,000 feet MSL.

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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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These requirements are the following: 12,500 FT MSL to 14,001 FT MSL (for more than 30 minutes): Crew must be on oxygen. 14,000 FT MSL to 15,000 FT MSL: All crew must be on oxygen. Above 15,000 FT MSL: Oxygen must also be provided to passengers but they are not required to use it.

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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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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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When the cabin altitude rises above 14 000 feet, the oxygen masks stored above the passenger seats, in the lavatories, galleys, and crew stations will deploy automatically. The flight crew may also manually deploy the oxygen mask system.

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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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