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643 - ATPL - The purpose of a diluter demand regulator in an oxygen system is to:

Question 643 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Deliver oxygen flow only above FL 100.
Deliver oxygen flow when inhaling.
Mix air and oxygen in a passenger oxygen mask.
Is only recommended with smoke in the cockpit.

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