Question

What is the oxygen requirement for an unpressurized aircraft at 15,000 feet?

A. Crew must use oxygen for the entire time above 14,000 feet and passengers must be provided supplemental oxygen only above 15,000 feet.
B. Crew must start using oxygen at 12,000 feet and passengers at 15,000 feet.
C. All occupants must use oxygen for the entire time at this altitude.

Answer 1

A. Crew must use oxygen for the entire time above 14,000 feet and passengers must be provided supplemental oxygen only above 15,000 feet.