777 Speed Trim
The 777 system requires pitch trim input to adjust the control system's target speed during manual (i.e., autopilot disengaged) flight when changing speed. With the pitch trim input activated (wheel mounted thumb switch or aislestand alternate pitch trim levers) the target speed is ramped up or down at a rate of 10 knots per second.
The 777 system automatically adjusts the elevator and stabilizer to balance pitch trim disturbances associated with configuration changes such as flaps, speedbrakes, or gear extension/retraction and changes in thrust. There is no need for the pilot to make trim inputs unless changing the desired steady operating speed. As a result, the pitch trim workload on the 777 is much less than on an unaugmented airplane.
Note that with automatic balancing of thrust pitching moments, it is common to fly the 777 with manual path control while the autothrottle is engaged. That combination is not recommended on most unaugmented airplanes as the pilot would find it necessary to adjust pitch trim every time that the autothrottle changed the thrust level.