When operating an aircraft at cabin pressure altitudes above 12,500 feet MSL up to and including 14,000 feet MSL, supplemental oxygen shall be used during
A
the entire flight time at those altitudes.
B
that flight time in excess of 10 minutes at those altitudes.
C
that flight time in excess of 30 minutes at those altitudes.✓ Correct Answer
Explanation
14 CFR 91.211(a)(1) requires the required minimum flight crew to use supplemental oxygen for that part of the flight at cabin pressure altitudes above 12,500 feet MSL up to and including 14,000 feet MSL that is more than 30 minutes long. Above 14,000 feet the crew must use it the entire time, and there is no 10-minute rule.
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