When supplemental oxygen is required under 14 CFR 91.211 - the 12,500, 14,000, and 15,000-foot rules - and why your body needs it far sooner.
PatternFAR 91.211 sets oxygen rules at 12,500, 14,000, and 15,000 feet - but your body needs oxygen far lower. Here's the difference.
PatternTime of Useful Consciousness at altitude is measured in seconds, not minutes - and hypoxia removes your ability to act before you recognize you're impaired.
TowerWhy wheel well stowaways almost never survive flight - the physics of hypoxia, extreme cold, and gear retraction explained for pilots.
TowerFAR 91.211 requires crew oxygen above 12,500 feet after 30 minutes, above 14,000 feet immediately, and passenger oxygen above 15,000 feet.
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