Originally Posted by
FlyJSH
For us ignorant types...
The autopilot trims in what would be several pounds of push to nose down to maintain glide path? That is, if everything kicks off, the PF must push hard to maintain level flight?
It pre-trims nose up so that when/if the AP is disconnects in the landing realm with thrust idle you don't get a big nose-down excursion.
If you do a go-around in that condition, you get large additional pitch up moment from the engine thrust (under wing engines).