If the roll axis is jammed, what should the crew do?

When faced with a jammed roll axis, pulling the aileron disconnect handle is the appropriate response. This handle, when activated, disconnects the ailerons from the control yoke, allowing the pilots to regain control of the aircraft's roll axis using the rudder instead. This is a critical emergency measure that enables the crew to manage the aircraft's lateral stability and maneuvering despite the ailerons being inoperative.

Activating the autopilot may not be an effective solution in this scenario, as the autopilot relies on functional flight control surfaces, which would be compromised if the roll axis is jammed. Changing heading immediately could put the aircraft in a less controlled state without addressing the root problem of the jammed axis. Descending to a lower altitude does not resolve the jammed roll axis issue and may further complicate the situation if the aircraft’s control surfaces are impaired.

Therefore, utilizing the aileron disconnect handle is the best course of action to maintain control of the aircraft in the event of a roll axis malfunction.