Which statement about the 737 oxygen systems is correct?

Which statement about the 737 oxygen systems is correct?

• A. There are two systems: cockpit and passenger
• B. There is a single system in the cockpit
• C. There are three systems
• D. There are only passenger systems

Answer: (A)

Two independent oxygen systems cover the airplane: one for the cockpit crew and one for the passenger cabin. The cockpit system has its own supply and masks so pilots can maintain control and operate the aircraft even if the cabin system is deployed. The passenger system provides oxygen to passengers via overhead masks, typically activated automatically with cabin depressurization. Having these two separate systems ensures a reliable oxygen supply for both flight crew and passengers, and prevents a problem in one system from compromising the other. The idea that there’s just one cockpit system, three systems, or only passenger systems doesn’t match how the 737 is designed.

Two independent oxygen systems cover the airplane: one for the cockpit crew and one for the passenger cabin. The cockpit system has its own supply and masks so pilots can maintain control and operate the aircraft even if the cabin system is deployed. The passenger system provides oxygen to passengers via overhead masks, typically activated automatically with cabin depressurization. Having these two separate systems ensures a reliable oxygen supply for both flight crew and passengers, and prevents a problem in one system from compromising the other. The idea that there’s just one cockpit system, three systems, or only passenger systems doesn’t match how the 737 is designed.