What happens to elevator trim when power is added?

When power is added in an aircraft, particularly when transitioning from a lower power setting to a higher one, the thrust generated by the engine increases. This increase in thrust can change the aircraft’s aerodynamic characteristics and result in a tendency for the nose to pitch upward. To maintain level flight and prevent the aircraft from climbing inadvertently, additional downward control force is needed on the elevator.

Elevator trim is used to relieve the pilot from continuously needing to apply this force. Therefore, when more power is added, it is often necessary to adjust the elevator trim upward to counteract the tendency for the nose to rise. This adjustment helps in maintaining a neutral control position, allowing the pilot to fly the aircraft more comfortably without constant control input.

In this scenario, the elevator trim's adjustment upward facilitates the management of the aircraft's pitch attitude during changes in power settings, ensuring stable flight control.