When the LDG ELEV selector is set, how is cabin altitude controlled?

When the LDG ELEV selector is set, cabin altitude is controlled automatically through the outflow valve. This system is designed to adjust the cabin pressure based on the selected landing elevation, ensuring a safe and comfortable environment for passengers and crew during approach and landing. The outflow valve modulates its position to maintain the proper cabin altitude as the aircraft descends.

The automatic control of cabin altitude via the outflow valve is integral to the aircraft's pressurization system. This system continuously monitors various parameters and adjusts the valve's position accordingly, allowing the cabin altitude to decrease in conjunction with the aircraft's descent without requiring manual input from the flight crew, which enhances situational awareness and reduces workload.

While other options mention manual controls or safety valves, these are not the primary means of altitude management in this scenario since the system is designed to operate automatically to optimize performance and safety during flight operations.