What should be done to regain aircraft control if there is an AFCS uncommanded deviation?

To regain control of the aircraft during an AFCS (Autopilot Flight Control System) uncommanded deviation, grasping the airplane control wheel firmly is the most immediate and effective response. This action allows the pilot to take manual control of the aircraft and counteract any unintended movements caused by the autopilot system.

Maintaining a firm grip on the control wheel provides direct and responsive control over the aircraft's flight path, enabling the pilot to react quickly to correct deviations and stabilize the aircraft. Additionally, this step is critical in ensuring the safety of the flight while also assessing any underlying issues with the AFCS that may need further attention.

While other actions such as pressing the autopilot disengage switch or adjusting trim settings may be part of a broader response, they do not provide the immediate manual control necessary to address an uncommanded deviation effectively. Checking the fuel level is not relevant in this context and does not contribute to regaining aircraft control during such an event.