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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Aircraft General Knowledge - Airframe, Systems, Powerplant > What does a passenger normally inhale through a vented continuous-flow oxygen mask?

236 - ATPL Question Bank in English - What does a passenger normally inhale through a vented continuous-flow oxygen mask?

Question 236 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot Licence

Cabin air only, without supplemental oxygen

100% supplied oxygen at all cabin altitudes, with no cabin air admitted

A mixture of oxygen and refrigerant gas

A mixture of supplied oxygen and cabin air

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