Aircraft and systems
Oxygen system
At a glance
Meaning of Oxygen system
Equipment supplying oxygen to crew or passengers when required.
More about Oxygen system
On a high-altitude airliner, passenger oxygen masks support occupants after a loss of cabin pressure while the aircraft descends to a suitable altitude.
Oxygen sources and operating duration vary with the aircraft. The system does not replace normal cabin pressurisation or support unrestricted continuation at cruise altitude after prolonged depressurisation.