During a flight, which statement is true about the flight director?

The flight director is an essential component in aviation that provides guidance to pilots during flight, making the statement about mode changes potentially causing disconnection accurate. When the flight director is in use, changing modes—such as switching from one autopilot mode to another or making significant adjustments to flight parameters—can lead to the deactivation of the flight director. This characteristic is crucial for pilots to understand, as it emphasizes the need for awareness of the aircraft's systems and how they interact during flight.

In contrast, the other statements do not accurately represent the functionalities of the flight director. It can be disconnected, indicating that the pilot maintains control and can override the system when necessary. The flight director operates effectively in both visual and instrument flight conditions, assisting pilots under various flying scenarios. Lastly, while it aids during manual control, it is not exclusive to that mode, as it is also integrated into autopilot systems to enhance overall flight safety and efficiency. Understanding these aspects is vital for effective instrument flying and managing the aircraft appropriately.