What is the primary function of a Control Display Unit?

• A. A display interfaced with the master computer, providing the pilot with a single control point for all navigation systems, thereby reducing the number of required flight deck panels.
• B. A display that provides engine instrument readings on a dedicated screen.
• C. A display used to control cabin pressurization.
• D. A display that shows weather radar data only.

Answer: (A)

The main idea is that the Control Display Unit serves as the centralized input and display interface for navigation data, connected to the master computer. It lets you enter routes, waypoints, altitudes, speeds, and performance constraints, and then it presents the flight plan and navigation information to you. Because it links directly to the flight management system, it acts as a single control point for navigation data, helping to streamline cockpit equipment by reducing the need for separate navigation panels. It’s not used for engine instrument readings, cabin pressurization control, or weather radar data—that information has its own dedicated displays and controls.