What does the PRESS MAN switch do in AUTO mode?

The PRESS MAN switch, when set to AUTO mode, plays a crucial role in managing the aircraft's cabin pressure automatically. The primary function is to control the pressurization system without the need for manual intervention. In this mode, the system continuously monitors the aircraft's altitude and adjusts the cabin pressure accordingly to ensure passenger comfort and safety.

In automatic pressurization mode, the aircraft's systems regulate the outflow valves, controlling the cabin altitude and ensuring it remains at a safe level as the aircraft climbs or descends. This automatic control helps to maintain a comfortable environment for passengers and crew throughout the flight.

The other options do not accurately describe the function of the PRESS MAN switch in AUTO mode. Selecting manual pressurization mode or activating standby oxygen systems refers to different operational scenarios, and maintaining cabin altitude is a result of the automatic management provided by the PRESS MAN switch when it's in AUTO mode, rather than a function of the switch itself.