L-1011 Autoflight: Flight Director Command Bars (22-8)

As you already know, each flight director switch connects its respective autopilot/flight director computer to command bars on the same side. Autopilot A to the Captain's command bars, autopilot B to the First Officer's command bars. Either or both flight directors may be selected simultaneously and are independent of autopilot engagement. With the flight director switch off, the command bars are biased out of view as shown on the First Officer's side. Placing the flight director switch to ON will bring the command bars into view as shown on the Captain's side.

In the pictured example:

Autopilot/flight director computer A will now provide steering information to the Captain since both autopilot autopilot levers are off, but the FD for the Captain's side is on. With Autopilot lever A on, autopilot A would fly the aircraft in pitch and roll and the flight director command bars would indicate to the Captain what the autopilot is doing.