SESK: Stuff Everyone Should Know · sesk.info/comm-oxygen-15000-every-occupant
Above 15,000 feet MSL cabin pressure altitude, who must be provided with supplemental oxygen?
Every occupant of the aircraft.
- Only the pilot in command
- Only passengers who ask
- Every occupant ✔
Why: Under 14 CFR 91.211(a)(3), no one may operate above 15,000 feet MSL cabin pressure altitude unless each occupant is provided with supplemental oxygen. Crew need oxygen sooner than passengers.
Huh, didn't know that: The AIM says useful consciousness can be lost in 20 to 30 minutes at 18,000 feet and 5 to 12 minutes at 20,000 feet.
Why was the passenger so happy about the oxygen mask? It really lifted his spirits.
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References
Answer: Every occupant. Under 14 CFR 91.211(a)(3), no one may operate above 15,000 feet MSL cabin pressure altitude unless each occupant is provided with supplemental oxygen. Crew need oxygen sooner than passengers.
- 14 CFR 91.211 Supplemental oxygen (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/14/91.211
unless each occupant of the aircraft is provided with supplemental oxygen
Checked 2026-10-10. - 14 CFR 91.211 Supplemental oxygen (Cornell LII mirror of eCFR) www.law.cornell.edu/cfr/text/14/91.211
at least a 10-minute supply of supplemental oxygen
Checked 2026-10-10. - AIM chapter 8 section 1, Fitness for Flight www.faa.gov/air_traffic/publications/atpubs/aim_html/chap8_section_1.html
lost in 20 to 30 minutes at 18,000 feet and 5 to 12 minutes at 20,000 feet
Checked 2026-10-10.
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