Definition
The pilot's use of the rudder pedals and/or the ailerons (operated by the control yoke or stick) to control the airplane about its vertical (yaw) and longitudinal (roll) axes. Rudder control yaws the nose left or right; aileron control banks the wings left or right. In many maneuvers — particularly in crosswind landings, slow flight, and stall recovery — the two are used together in a coordinated way to keep the airplane tracking and oriented as the pilot intends.
Plain English
Using the rudder pedals to swing the nose left or right, and/or the ailerons to roll the wings left or right. The phrase 'and/or' simply means the pilot may use one, the other, or both at the same time, depending on what the airplane needs.
Context Anchor
Seen in airplane handling, recovery, crosswind, and upset discussions where the pilot must keep or regain control of the airplane’s direction and bank.
Derivation
Rudder comes from an old word for a steering oar on a boat, which helps because an airplane’s rudder steers the nose left or right through the air. Aileron comes from French for “little wing,” which helps because ailerons are small movable parts on the wings that help roll the airplane.
Why Pilots Care
Correct application prevents drift, maintains alignment with the runway, and avoids loss of control on the ground or in crosswinds.
Intuition Check
Do not read “and/or” as “always use both at the same time.” It means rudder alone, aileron alone, or both together, depending on what the airplane is doing.
Example Sentence 1
During the crosswind landing, the pilot used rudder and aileron control to keep the nose aligned with the runway while preventing the upwind wing from rising.
Example Sentence 2
During a steep turn the pilot applies aileron control to establish the bank while adding rudder to cancel adverse yaw.