Practicing some takeoffs and landings, I've seen some unexpected behaviour of F/D and FCC Masterlights:
After takeoff with both F/D's ON (left is Master) and A/T armed (takeoff mode), when engaging A/P left in CMD mode the Masterlight disapears.
Now both F/D Switches are ON, no one seems to be Master, A/P left is in CMD and F/D bars are full functional.
On last approach segment, I switch left F/D off to remove the F/D bars. Subsequently I disconnect the A/P to continue fully manual, the left FCC becomes master!
Now the left F/D switch position is OFF, right F/D switch is ON and left Masterlight indicates ON?
-Michael