Definition
A mechanical component in a hydromechanical flight control system that allows the pilot to mechanically separate the cockpit control input from the powered (hydraulic) actuator, so the control surface can be moved by direct mechanical means if the powered system fails.
Plain English
A part that lets the pilot disconnect the hydraulic power assist from the controls so the controls can still be moved by hand if the hydraulic system stops working.
Context Anchor
Seen in diagrams and descriptions of hydromechanical flight control systems, where cockpit controls are connected to powered units that move the control surfaces.
Derivation
Power' refers to the hydraulic power that normally moves the control surface. 'Disconnect' means to separate. 'Linkage' is a set of mechanical rods or levers that transmit motion. Together: the mechanical part that separates the controls from the hydraulic power source when needed.
Why Pilots Care
It provides a reliable way to retain aircraft control during hydraulic failure by enabling immediate manual reversion.
Intuition Check
Do not read “power” here as engine power or electrical power. In this context, it means powered assistance in the flight control system, usually from hydraulic force.
Example Sentence 1
When the hydraulic pressure dropped, the power disconnect linkage allowed the pilot to control the aircraft mechanically.
Example Sentence 2
During the postflight inspection the mechanic verified that the power disconnect linkage moved freely and locked securely.