What is the role of the LDG ELEV Selector in the pressurization system?

The LDG ELEV Selector is primarily responsible for indicating the landing elevation. When a pilot inputs the expected landing elevation into this selector, it aids the pressurization system in accurately maintaining the desired cabin altitude relative to the airport's elevation. This is crucial during landings, as the pressurization system must adjust to ensure a smooth transition from high altitude to ground level, allowing for optimal passenger comfort and safety.

While the other choices relate to different aspects of the pressurization system, they do not directly define the role of the LDG ELEV Selector. The pressurization mode, cabin altitude, and outflow valve position are all important elements; however, they are controlled or set by other systems or selectors within the aircraft. The LDG ELEV Selector specifically focuses on maintaining the correct reference point for landing, which is essential for the successful operation of the aircraft's pressurization system.