What does controllability refer to in aviation?

• A. The maximum speed of an aircraft under pilot input
• B. A measure of the response of an aircraft relative to the pilot's flight control inputs
• C. The amount of fuel required to maintain level flight
• D. The time needed to reach cruise altitude

Answer: (B)

Controllability is how readily and predictably an aircraft responds to the pilot's control inputs. It describes the dynamic relationship between input from the flight controls and the resulting change in attitude and flight path. A highly controllable aircraft reacts quickly and reliably to commands, with predictable behavior across flight conditions. The other options describe speed capability, fuel endurance, or climb timing, which are not about how control inputs translate into motion.