In response to a roll trim runaway, which button should be pressed and held?

In the event of a roll trim runaway, the appropriate action is to press and hold the AP/TRIM Disc button. This button serves a critical role in managing the autopilot and trim systems. When engaged, it disconnects the autopilot and cancels any unwanted trim inputs that may be contributing to the roll trim issue. By doing this, it allows the pilot to regain control of the aircraft and stabilize it in the desired flight attitude.

The function of the AP/TRIM Disc button is specifically designed to address situations like a trim runaway scenario, enabling the pilot to exert manual control over the aircraft’s roll behavior. This is essential for safety and maintaining flight control, as trim runaways can lead to unintended and hazardous aircraft movements.

Other buttons, such as the RUDDER TRIM, CONTROL COLUMN, and ELEVATOR TRIM buttons, do not specifically address the trim runaway condition in the context of roll control. Instead, they serve to adjust other aspects of the flight control surfaces or trim systems, making them less relevant for directly counteracting a roll trim runaway.