Definition
Rigid metal rods used in some aircraft flight control systems to transmit pilot inputs from the cockpit controls to the control surfaces. They operate by being physically pushed or pulled along their length, transferring linear motion through bell cranks and linkages to move ailerons, elevators, or other surfaces.
Plain English
Stiff metal rods that connect the pilot's controls to the moving parts of the wings and tail. When the pilot moves the yoke or stick, these rods either push forward or pull back to make the control surface move.
Context Anchor
Seen in flight control system descriptions, including how the ailerons are connected to the pilot’s controls.
Derivation
The name describes exactly what the tube does in operation. It is called 'push-pull' because the same rod transmits force in both directions -- pushing for one input, pulling for the opposite input -- rather than only working in one direction like a cable.
Why Pilots Care
They give direct, precise movement to the ailerons without the stretch or slack that can occur with cable systems.
Intuition Check
Do not picture a tube carrying air or fluid. In this context, a push-pull tube is a stiff mechanical link that transfers the pilot’s movement to a control surface.
Example Sentence 1
The ailerons in this trainer are operated by push-pull tubes rather than cables, which gives the controls a noticeably solid feel.
Example Sentence 2
During inspection the pilot checked the push-pull tubes for dents or loose fittings.