What is the first memory item when dealing with a jammed aileron?

In the scenario of a jammed aileron, the first action to take is to disengage the autopilot. This is crucial because the autopilot may be controlling the ailerons and responding based on its programmed inputs, which can complicate the situation further. By disengaging the autopilot, the pilot takes direct control of the aircraft, allowing for a better response to the unexpected condition of the jammed aileron. This step is pivotal in regaining manual control and assessing the situation effectively.

Other options entail actions that are important but should be executed after ensuring that the autopilot is disengaged. For instance, pulling the roll disc can aid in managing the aircraft's roll tendency, and releasing pressure on the aileron controls is also an important maneuver. However, ensuring that the autopilot is disengaged takes precedence to maintain pilot control over the aircraft's maneuverability.