What is the function of the flight control gust lock?

The function of the flight control gust lock is to lock the primary flight control surfaces when the aircraft is parked. This is crucial for preventing uncommanded movement of the control surfaces due to wind or other external forces while the aircraft is not in operation. By securing the ailerons, rudder, and elevator, the gust lock helps to protect the control surfaces from potential damage and ensures that the aircraft remains in a stable condition during periods of inactivity.

In contrast, the other options reference functions that do not align with the role of the gust lock. Enhancing flight handling characteristics pertains to design features that improve maneuverability, and reducing aerodynamic drag relates to the aircraft's performance while flying, neither of which is the responsibility of the gust lock. Assisting in automatic takeoff is outside the scope of what the gust lock does, as its primary purpose is related to the ground state of the aircraft rather than any operational phases of flight.