oxygen requirements (unpressurized)

Question 1

above 12,500 - including 14,000 MSL
unpressurized cabins

Answer 1

required minimum flight crew must be PROVIDED with & USE supplemental o2 for period of 30+ minutes at these altitude

Question 2

above 14,000’ (14,001+)
unpressurized cabins

Answer 2

required minimum flight crew must be PROVIDED with & USE supplemental o2 for the entire time at these altitudes

Question 3

above 15,000

Answer 3

each occupant must be PROVIDED with o2