Definition
A physical system of rods, cables, pulleys, bellcranks, and similar hardware that transmits the pilot's control inputs from the cockpit controls to the flight control surfaces.
Plain English
The actual hardware—cables, rods, and pulleys—that connects what the pilot moves in the cockpit to the moving parts on the wings and tail.
Context Anchor
Seen when learning how cockpit controls move the airplane’s flight control surfaces.
Derivation
From Latin 'mechanicus' (relating to machines) and Old English 'linc' (a connecting piece). A linkage is literally the chain of physical pieces linking one thing to another.
Why Pilots Care
It explains why control feel and response remain predictable in normal flight and why binding, slack, or wear must be checked before every flight.
Analogy
A bicycle brake cable is a simple kind of mechanical linkage: when you squeeze the brake handle, the connected parts carry that motion to the brake.
Intuition Check
Do not read mechanical linkage as an electrical signal or computer command. Here it means a physical connection: moving one part directly causes another part to move.
Example Sentence 1
When the pilot moves the yoke to the right, mechanical linkage transfers that motion to the ailerons, which then deflect to roll the airplane.
Example Sentence 2
During the preflight inspection the pilot checked for free play in the mechanical linkage by gently moving the controls while watching the surfaces.