Which buttons on the FCP are used to change the lateral mode?

The buttons used to change the lateral mode on the Flight Control Panel (FCP) are HDG and NAV. When selecting the HDG button, the aircraft operates in heading mode, allowing pilots to maneuver based on a specific heading. Conversely, selecting the NAV button transitions the aircraft into navigation mode, enabling it to follow a predefined flight path or route based on navigational aids or flight management system inputs. This functionality is essential for accurately controlling the aircraft's lateral trajectory during flight, particularly in various phases such as departure, en-route, and approach.

Understanding these modes is crucial for pilots as they dictate how the aircraft interacts with navigation systems and help maintain proper course and heading during flight operations.