The Flight Director Bar in a conventional ADI is produced by which component?

• A. Flight Director Computer
• B. EADI
• C. HSI
• D. ADP

Answer: (A)

The flight director bar shows the attitude the airplane should fly to follow the selected guidance, and it is produced by the Flight Director Computer. This computer takes inputs from navigation, flight path modes, and sensor data, computes the required pitch and bank commands, and then drives the indicator to display that cue on the conventional attitude indicator. The attitude indicator itself merely shows the aircraft’s current attitude, while the EADI, HSI, and ADP provide display or data functions (attitude, heading/navigation information, and air data, respectively) and do not generate the flight director cue. So the proper source of the flight director bar is the Flight Director Computer.