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Question 1 of 10
Fii
medium
Under 14 CFR 91.211, when must pilots of an unpressurized aircraft use supplemental oxygen?
A
Above 10,000 feet MSL at all times
B
Above 12,500 feet MSL if that altitude is flown for more than 30 minutes; above 14,000 feet MSL regardless of duration; passengers above 15,000 feet MSL
C
Above 14,000 feet MSL for pilots only
D
Above 18,000 feet MSL for all occupants
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