Force Trim is used to relieve the pilot of the need to maintain constant pressure on the flight controls. The system uses a magnetic clutch and springs to hold the Cyclic control in the position where it was released. The system does not use sensor-based data to make corrections, but rather is used by the pilot to “hold” the Cyclic in a desired position and adapt the control force.

The most basic versions only apply to the Cyclic, requiring the pilot to continue power and Tail Rotor inputs. With the Force Trim on or in use, the pilot can override the system by disengaging the system through the use of a Force Trim release button or, with greater resistance, can physically manipulate the controls.

There are two types of trim system, which can be installed independently or together:

In the first system, a magnetic brake (clutch) fixes the feel springs’ anchor point to the structure of the helicopter.

In the second system an electric motor and screw jack adjusts the anchor point relatively slowly when the trim switch is used.