Plain English Meaning

A system that, if an engine quits during takeoff, automatically turns the dead engine's propeller blades sideways to the airflow so they don't drag the airplane down while the pilot is busy flying.

Full Definition

An automatic propeller feathering system on multiengine turboprop airplanes that, when armed and triggered by a sensed loss of engine power (typically below a set torque threshold during takeoff or initial climb), automatically rotates the propeller blades of the failed engine to a streamlined, edge-on to minimize drag without action.