To improve reliability and safety of an actuator assembly for a high-lift device, a torque sensing device is provided on a static structural part, which is used to mount the actuator of the actuator assembly to an aircraft interface, such as a rib or an interconnection strut. A controller determines a reaction torque value based on the output signal of the torque sensing device and monitors and controls the actuator based on the reaction torque value and predetermined load thresholds.