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Flight rulesQuestion 110 of 934

At what cabin pressure altitude must the required minimum flight crew use supplemental oxygen after 30 minutes?

  1. Above 8,000 feet MSL up to and including 10,000 feet MSL
  2. Above 12,500 feet MSL up to and including 14,000 feet MSL
  3. Above 10,000 feet MSL up to and including 12,500 feet MSL
  4. Above 14,000 feet MSL up to and including 15,000 feet MSL
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Correct answer: Above 12,500 feet MSL up to and including 14,000 feet MSL

Between 12,500 and 14,000 feet MSL, the crew must use oxygen for the part of the flight that is more than 30 minutes.

Source: 14 CFR Part 91, § 91.211 Supplemental oxygen.

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Questions last reviewed: 18 October 2026