What is the purpose of an oxygen system onboard an aircraft?

The primary purpose of an oxygen system onboard an aircraft is to provide supplemental oxygen to pilots and passengers at high altitudes. As altitude increases, the partial pressure of oxygen decreases, which can lead to hypoxia – a condition where the body does not get enough oxygen. At elevations above 10,000 feet, the risk of hypoxia becomes significant, and the use of supplemental oxygen becomes essential to maintain cognitive function and physical performance.

While cabin cooling, fire suppression, and stability may be important aspects of aircraft systems, they do not pertain to the function of the oxygen system. The oxygen system is specifically designed to ensure that all occupants receive adequate oxygen to prevent the adverse effects of low atmospheric pressure conditions encountered at high altitudes. By providing a reliable source of oxygen, the system safeguards against the hazards associated with insufficient oxygen availability, thereby contributing to the safety and efficacy of flight operations.