Definition
A flight control design in which the ailerons and rudder are mechanically or electronically linked so that movement of one automatically produces a coordinated movement of the other. When the pilot applies aileron to roll into a turn, the linked system applies the appropriate amount of rudder at the same time, helping keep the turn coordinated without separate rudder input.
Plain English
The aileron and rudder controls are connected, so when you bank the airplane the rudder moves on its own to help keep the turn smooth. You don't have to push the rudder pedal yourself.
Context Anchor
Seen in flight control system discussions, especially when learning how some airplanes reduce adverse yaw during turns.
Derivation
Coupled comes from the Latin copula, meaning a link or tie. Here it simply means the two controls are tied together so they act as one.
Why Pilots Care
Reduces the need for the pilot to apply separate rudder input, lowering workload and helping maintain coordinated flight without slips or skids.
Analogy
It is like a car whose front wheels and headlights turn together. Turning the wheel mainly steers the car, but the linked part helps point things in the same direction.
Intuition Check
“Coupled” does not just mean the ailerons and rudder are both present on the airplane. Here it means their movement is physically or mechanically linked so one control input helps move both.
Example Sentence 1
Because this trainer has coupled ailerons and rudder, the student rolled into the turn and the airplane stayed coordinated without any pedal input.
Example Sentence 2
Because the airplane has coupled ailerons and rudder, the pilot could focus on the horizon instead of constantly adjusting the rudder pedals.