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4053
What is the oxygen requirement for an unpressurized aircraft at 15,000 feet?
| | A) Crew must start using oxygen at 12,000 feet and passengers at 15,000 feet. |
| | B) All occupants must use oxygen for the entire time at this altitude. |
| * | C) Crew must use oxygen for the entire time above 14,000 feet and passengers must be provided supplemental oxygen only above 15,000 feet. |
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