Originally Posted by
sm165019117
when the flight director is not required, the pilots in left and right seat
should reset it according to the procedures:
Flight Director Switches (Both) .......................................OFF PM
Flight Director Switch ......................................................... ON PM
what's the purpose of turning PM's FD ON?
it’s for SPD. It turns on V/S vertical mode, thus the autothrottle will maintain the speed and you can use until touchdown