What is the purpose of the oxygen crossfeed switch?

The purpose of the oxygen crossfeed switch is to connect the crew and passenger oxygen systems. This function is essential in ensuring that both the crew and passengers have access to supplemental oxygen during situations where cabin pressure is compromised or altitude is sufficiently high. By allowing the two systems to be interconnected, the crossfeed switch provides flexibility and redundancy in the oxygen supply, ensuring that all occupants can receive essential breathing support when needed.

When the crossfeed switch is activated, it enables the sharing of oxygen resources between the crew and passenger compartments. This capability is crucial for maintaining safety and operational effectiveness during flight. The switch allows for a centralized management of oxygen supplies, helping to ensure that the needs of all individuals on board are met, particularly in emergency scenarios.