What is the role of the autothrust disconnect buttons on the thrust levers?

The autothrust disconnect buttons located on the thrust levers serve the specific function of disconnecting the autothrust system when activated. When the autothrust system is engaged, it automatically adjusts the thrust to maintain the desired airspeed, which is critical for flight stability and efficiency. However, in situations where the pilot needs to take manual control over thrust—such as in the event of a malfunction, changing operational conditions, or for specific phases of flight—the pilot can press the disconnect buttons. This action allows the pilot to assume full control over the engine thrust settings without the automatic adjustments of the autothrust system.

Engaging the autothrust system itself is not the function of these buttons, nor are they responsible for setting the thrust levers automatically or performing a go-around maneuver. Instead, they provide a crucial safety feature, giving pilots the ability to override automatic thrust management as necessary. This understanding of the buttons' function is essential for effective aircraft operation and safety during various flight conditions.