Originally Posted by
Firefighter
I heard that the movements from the manual trim could also be from the aerodynamic forces, a result of leaving throttles at full the entire time? Is it a possibility?
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No. Aerodynamic forces could not move the trim (Google Jack screw THS) to learn why not.
Aerodynamic force can and will make the trim harder to actuate. The electric trim motor doesn't notice but a pilot manually trimming will notice.