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Flight rulesQuestion 111 of 934

At what cabin pressure altitude must the required minimum flight crew use supplemental oxygen for the entire flight time?

  1. Above 10,000 feet MSL
  2. Above 12,500 feet MSL
  3. Above 14,000 feet MSL
  4. Above 15,000 feet MSL
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Correct answer: Above 14,000 feet MSL

Above 14,000 feet MSL, the crew must use oxygen during the entire flight time at those altitudes.

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

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Questions last reviewed: 18 October 2026