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Supplemental Oxygen
Oxygen provided to crew or passengers to prevent hypoxia at altitude. For unpressurized Part 91 flights under 14 CFR 91.211, required minimum flight crew must use oxygen after more than 30 minutes above 12,500 feet cabin altitude, continuously above 14,000 feet, and every occupant must be provided oxygen above 15,000 feet. FAA guidance also encourages earlier use, especially at night.
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