What can be done to avoid a change in thrust when disconnecting the autothrust system?

To avoid a change in thrust when disconnecting the autothrust system, matching the thrust lever to the existing power setting is the most effective approach. When the autothrust is operating, it controls the thrust levers to maintain the desired speed. If the autothrust is disconnected without adjusting the thrust levers, it can result in a sudden change in thrust due to the levers being moved to a different position by the system.

By manually matching the thrust levers to the power setting at the moment of disconnect, the pilot ensures a smooth transition of control from the autothrust system to manual operation, thereby preventing any uncommanded changes in thrust. This technique helps maintain the aircraft’s performance and reduces the risk of unwanted speed changes during critical phases of flight.