The Multipurpose Control and Display Unit (MCDU) is a key component of the Flight Management and Guidance System (FMGS) in Airbus aircraft such as the A320, A330, and A350 families. It serves as the pilot's primary interface for entering flight data, configuring navigation, and managing performance settings. Purpose of the MCDU The MCDU allows pilots to: Input flight plans and waypoints Calculate performance data (takeoff, cruise, descent) Configure navigation radios Communicate via datalink (ACARS) if equipped Monitor fuel, time, and alternate predictions Access secondary flight plans for contingencies Layout and Components The MCDU consists of: Screen (CRT or LCD): Displays data in a menu-driven format. Line Select Keys (LSKs): Located on either side of the screen for data input. Alphanumeric Keyboard: Used to type in waypoints, values, or commands. Function Keys: Includes keys such as INIT, F-PLN, RAD NAV, PERF, and more. Key Pages and Functions INIT...