Definition
The pilot's use of the rudder pedals to manage the airplane's movement about its vertical axis (yaw), keeping the nose properly aligned and coordinating turns so the airplane is neither slipping nor skidding.
Plain English
How the pilot uses the foot pedals to keep the nose pointing where it should, especially during turns and when keeping the wings and nose working together smoothly.
Context Anchor
Seen in straight-and-level instrument flight when the pilot is maintaining heading by reference to the flight instruments.
Derivation
From the old nautical 'rudder,' the hinged board at the back of a ship used to steer it. On an airplane, the rudder is the hinged surface on the tail's vertical fin, and the pilot moves it with foot pedals. 'Control' here means the pilot's input, not an automatic system.
Why Pilots Care
Proper rudder inputs keep the aircraft coordinated, reduce drag, and maintain precise heading, especially critical when visual references are absent.
Intuition Check
Rudder control does not mean steering the airplane like a car. It means using the pedals to keep the nose aligned and prevent unwanted left-right swing.
Example Sentence 1
The instructor pointed out that sloppy rudder control was causing the heading to drift during straight-and-level flight.
Example Sentence 2
Subtle rudder control inputs counteracted the left-turning tendency while holding altitude and airspeed.