Originally Posted by
etudiant
As a humble SLF, my question would be 'How does the average Joe Pilot react when his airplane is unexpectedly trimming ever more nose down?'
How can the pilot control attitude when the airplane will not stay trimmed?
Humble answer: The pilot keeps inputing nose up trim to counter the undesired nose down trim. At some point when the pilot gets tired of repeatedly putting in nose up trim, the pilot deactivates the electric stab trim system and reverts to manual trim.