197 - ATPL - The purpose of an aeroplane automatic trim system is to trim out the hinge moment of the:

Question 197 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

Elevator(s)
Elevator(s), rudder(s) and ailerons.
Elevator(s) and rudder(s)
Rudder(s)

Training tests and timed exam simulations ATPL - Airline Transport Pilot license