Which function primarily describes the Flight Director system?

The function that primarily describes the Flight Director system is to assist pilots in maintaining selected flight paths. The Flight Director is a crucial tool in modern aviation, providing visual guidance to pilots. It generates command cues displayed on the cockpit instruments, indicating the necessary adjustments pilots must make to align their aircraft with the desired trajectory. This guidance is particularly vital during critical phases of flight, such as takeoff, approach, and landing, where maintaining precise control of the aircraft's path is essential for safety.

The system enhances situational awareness and helps pilots execute complex flight maneuvers more effectively. By showing them how to adjust the aircraft's heading, altitude, and speed to maintain the selected flight path, the Flight Director system plays a fundamental role in automated and manual flight operations.