Which buttons on the FCP control lateral modes?

The buttons on the Flight Control Panel (FCP) that control lateral modes in the context of navigation and flight management systems are primarily designed to influence the aircraft's lateral navigation and heading capabilities. The correct option lists HDG, NAV, B/C, and APPR, which are crucial buttons for managing these functions.

• HDG (Heading) mode allows pilots to control the aircraft by maintaining or selecting a specific heading. It commands the autopilot to focus on directional control based on the selected heading.

• NAV (Navigation) mode guides the aircraft along a defined flight path as programmed in the Flight Management System (FMS). This allows the aircraft to follow waypoints and airways effectively when in autopilot.

• B/C (Back Course) mode is utilized when an aircraft is flying an approach to an airport and can switch control to fly a back course approach if necessary. This is important for utilizing certain runway approaches.

• APPR (Approach) mode is essential for guiding the aircraft during the approach phase of flight, helping align the aircraft with the runway for landing.

These functions are essential for managing the aircraft's lateral navigation as they directly influence flight direction and path following in various phases of flight, particularly when aligning with approach