Definition
A flight control arrangement in which the pilot's input is transmitted directly to the control surface through a mechanical linkage of cables, pushrods, bellcranks, or torque tubes, without hydraulic, electrical, or other power assistance between the cockpit control and the surface.
Plain English
When you move the stick or yoke, your muscles are what actually move the control surface, through a mechanical connection. There is no power booster in between.
Context Anchor
Seen in descriptions of flight control systems, especially in light aircraft and maintenance discussions.
Derivation
Direct' comes from Latin directus, meaning 'straight' or 'without anything in between.' That captures the idea: the pilot's input goes straight to the surface with nothing assisting or modifying it along the way.
Why Pilots Care
In a direct control aircraft, the forces you feel on the stick or yoke are the real aerodynamic forces acting on the control surface. That feedback tells you about airspeed, load, and how the aircraft is responding -- information that is filtered or simulated in powered systems.
Intuition Check
Direct control does not mean the airplane is easier or simpler in every way. It means the pilot’s control movement is mechanically connected to the part being moved, without a powered system changing the command in between.
Example Sentence 1
Most light single-engine trainers use direct control, so the pilot feels the aerodynamic loads on the surfaces through the yoke.
Example Sentence 2
Because the aircraft uses direct control, the pilot must apply more force in turbulence than in a boosted system.