Originally Posted by
vilas
Can you explain how does it compensate for thrust changes. In speed stable system if thrust is increased and if the flight path is maintained i.e. if the nose doesn't come up speed will increase. Similarly if the thrust is decreased if the nose doesn't drop speed will decrease. That's what happens in Airbus. What happens in 777?
It "compensates" as in, prevents the thrust couple from changing the speed maintained hands off.
It does not "compensate" as in, prevent the attitude from changing; this would, of course, vary the speed and go against the fundamental point of the control law (and would essentially turn it into the Airbus control law, as you note)