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4042
If an unpressurized aircraft is operated above 12,500 feet MSL, but not more than 14,000 feet MSL, for a period of 2 hours 20 minutes, how long during that time is the minimum flightcrew required to use supplemental oxygen?
| | A) 2 hours 20 minutes. |
| * | B) 1 hour 50 minutes. |
| | C) 1 hour 20 minutes. |
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