B777 THR VNAV SPD mode
Hello everyone,
Could someone please explain me which value of thrust is computed by the AT THR mode on the triple when the aircraft is flying in VNAV SPD during descend? I understand in VNAV SPD, the aircraft controls the speed using the elevators…but why does the AT command IDLE at some given time…and THR at other? Is THR commanded when we are below the flight path to not ‘dive’ in idle and therefore not increase our profile to the calculated path?
Did not find anything in the FCOM regarding this subject.
Thanks!