Plain English Meaning

Cockpit-controlled valves that cut off fuel and other fluids running into a failed or burning engine, so those fluids cannot feed a fire or leak into the engine bay.

Full Definition

Valves located at the firewall of each engine that, when activated, stop the flow of fuel, oil, and hydraulic fluid from the airframe into the engine compartment. In multiengine airplanes they are typically operated from the cockpit as part of the engine securing or feathering procedure following an engine failure or fire.

Context Anchor

Seen in engine-securing and emergency checklist discussions, especially after feathering a propeller on a .