AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/comm-oxygen-12500-30-minutes

Cabin pressure altitude is between 12,500 and 14,000 feet MSL. After how long must the required crew use oxygen?

Start playing free

  1. As soon as you pass 12,500 feet
  2. More than 60 minutes
  3. More than 30 minutes

🔒 The answer is for AhaBulb members. Members see the answer, why it's right and the official sources for every card of Stuff Every Commercial Pilot Should Know, plus timed practice exams.

The first 50 cards of every test are free to play.

Play the free cards See membership

Like this card?
Play the game

References

  1. eCFR 14 CFR 91.211 Supplemental oxygen www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-C/section-91.211 Checked 2026-10-11.
  2. eCFR 14 CFR 91.211 Supplemental oxygen www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-C/section-91.211 Checked 2026-10-11.
  3. AIM chapter 8 section 1, Fitness for Flight www.faa.gov/air_traffic/publications/atpubs/aim_html/chap8_section_1.html Checked 2026-10-11.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

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

That's stuff everyone should know.