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?

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What limitation is imposed on a newly certificated commercial airplane pilot if that person does not hold an instrument pilot rating?

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Which flight time may be logged as instrument time when on an instrument flight plan?

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What portion of dual instruction time may a certificated instrument flight instructor log as instrument flight time?

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To meet the minimum instrument requirements, within the last 6 calendar months, you need

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