What is the FAA requirement for oxygen?

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 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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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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Lower levels of oxygen in your blood may make you feel unwell or could even be harmful to you during or after your flight. This means that, even if you do not usually need oxygen, you may need it while flying. Additional oxygen keeps the oxygen levels in your blood at a comfortable level and keeps you safe.

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What is the primary distinction between these different parts of the regulations? Part 91 applies to general aviation and non-commercial operations(civil aircraft). Part 135 applies to commercial on-demand operations(such as private jets). Part 121 applies to large-scale scheduled commercial air carriers.

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