Originally Posted by
OPENDOOR
With ALT selected the "annunciator" (two labeled lights) will tell you to trim if necessary. Same with HDG or NAV, it doesn't know it just senses control loads.
You are flying AP coupled ALT hold mode and the aircraft is in trim at the desired airspeed. You fly through a sinking airmass. The AP drives the pitch servo to increase nose up elevator and illuminates the TRIM UP annunciator. What do you do?
I would add power.