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394 - ATPL - The built-in passenger oxygen system be activated by:

Question 394 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Opening the oxygen-bottle valves.
Switching the diluter demand regulator ON.
Switching the diluter demand regulator and the passenger oxygen ON.
Switching the passenger oxygen on.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license