Flight director
A flight director , or FD for short , is an "aid" for the pilot of an aircraft, a graphic marking in the flight position indicator and a data source.
The name Flight Director comes from English flight (flight) and English director ( setpoint generator in technical English), literally about flight value generator . It is shown as a symbol (depending on the type of aircraft) in the flight position indicator and is intended to help the pilot maintain course and direction. The flight director can serve as a value transmitter for the autopilot (AP); If the autopilot is activated, it either uses the entered values (course information, speed settings, etc.) as a guide; if such values or settings are not available, the autopilot follows the flight director.
When the pilot activates the flight director, the symbol symbolizes the chosen course, if the AP is also switched on, he or she aligns itself with this and continues to follow it (if this is possible).