Autopilot A has an FD switch to engage the Captain's flight director (APFD Engage Panel) and a lever to engage one side of the dual pitch and roll autopilot servos. Both the Captain's flight director and one side of the autopilot servos can be driven by autopilot/flight director computer A. The First Officer's side does the same thing with autopilot B.
Either autopilot is capable of flying the aircraft in pitch and roll. Yaw is automatic in pitch and roll and will be discussed in a later blog posting.
Both flight directors may be on at the same time, each using individual autopilot computers. Only one autopilot may be engaged at a time. The second autopilot is electro-mechanically locked in the OFF position. A normal configuration is to have one autopilot engaged and both flight directors on. The only exception for both autopilots to be engaged is when the approach/land mode is engaged.
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