Domanda 265, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

The Same Source Of Supply Is Used By The Crew And Passengers.
With the setting on "NORMAL", the crew breathes a mixture of oxygen and cabin air.
The passenger source of supply never uses chemically generated oxygen.
The Seals Must Be Carefully Greased To Avoid Sparks.