Why do flight directors display flight guidance cues on the attitude indicators?

The flight directors display flight guidance cues on the attitude indicators primarily to assist the flight crew in maintaining a specified flight path. This means that the cues help pilots understand how to maneuver the aircraft to stay on course during various phases of flight. The guidance provided is often based on the aircraft’s autopilot system and is designed to help with both lateral and vertical navigation. By displaying these cues, flight directors provide visual references that can enhance situational awareness and improve adherence to intended flight paths, even in challenging conditions.

While enhancing navigation capabilities is certainly a benefit that results from using flight directors, the core function is more focused on providing specific guidance to achieve desired flight paths rather than just enhancing general navigation capabilities. Real-time weather updates and altitude changes are unrelated to what flight directors display, as their primary purpose is not to convey weather conditions or altitude information, but rather to facilitate the correct control responses required to follow a flight plan accurately.