Use of flight director BOEING 777

[sm165019117]

Originally Posted by Mr Good Cat

EDIT: Ignore previous... Just remembered it's to ensure the FDs stay displayed when TOGA mode finishes (other mode selected / becomes active). They will auto pop-up with FD switch off, but disappear again later.

thanks for answering, could do you explain when pm side turning on, the FMA is changed showing "ATT" what' s this used for?