Flight rulesQuestion 112 of 934

At what cabin pressure altitude must each occupant be provided with supplemental oxygen?

  1. Above 12,500 feet MSL
  2. Above 14,000 feet MSL
  3. Above 18,000 feet MSL
  4. Above 15,000 feet MSL
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Correct answer: Above 15,000 feet MSL

Above 15,000 feet MSL, each occupant must be provided with supplemental oxygen.

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

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Questions last reviewed: 18 October 2026