What is the function of an oxygen system on an aircraft?

The function of an oxygen system on an aircraft is fundamentally to provide supplemental oxygen to the crew and passengers at high altitudes. At elevations above certain thresholds, the air becomes thinner, leading to a decrease in the amount of oxygen available for breathing. This can lead to hypoxia, a condition where the body does not get enough oxygen. The oxygen system addresses this risk by supplying additional oxygen to ensure that everyone on board can breathe adequately, thus maintaining cognitive and physical performance during flight operations.

In aircraft operating at high altitudes, where ambient oxygen levels are insufficient for normal physiological function, the oxygen system becomes crucial. It helps ensure safety and comfort by preventing altitude sickness and allows pilots and passengers to operate effectively and remain alert.