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Above what cabin pressure altitude must supplemental oxygen be provided to every occupant of the aircraft?

15,000 feet MSL.

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  1. 12,500 feet MSL
  2. 10,000 feet MSL
  3. 15,000 feet MSL ✔

Why: Section 91.211(a)(3) requires each occupant to be provided with supplemental oxygen above a cabin pressure altitude of 15,000 feet MSL. The required crew must use oxygen the entire time above 14,000 feet.

Huh, didn't know that: Provided with oxygen means available. The rule for passengers is about providing it, not using it.

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Why did the passenger need oxygen? Things were getting a little rarefied.
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References

Answer: 15,000 feet MSL. Section 91.211(a)(3) requires each occupant to be provided with supplemental oxygen above a cabin pressure altitude of 15,000 feet MSL. The required crew must use oxygen the entire time above 14,000 feet.

  1. 14 CFR 91.211 Supplemental oxygen (Cornell LII eCFR mirror) www.law.cornell.edu/cfr/text/14/91.211
    at cabin pressure altitudes above 15,000 feet (MSL) unless each occupant of the aircraft is provided with supplemental oxygen
    Checked 2026-10-10.

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FlyingAt cabin pressure altitudes above 12,500 and up to 14,000 feet, crew must use oxygen after how much time?FlyingAbove 15,000 feet MSL cabin pressure altitude, who must be provided with supplemental oxygen?FlyingCabin pressure altitude is between 12,500 and 14,000 feet MSL. After how long must the required crew use oxygen?

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