Plain English Meaning

A system that lands the airplane by itself, using the autopilot and ground-based guidance signals to fly it down to the runway and put it on the ground.

Full Definition

An integrated airborne system that automatically flies the aircraft through the final approach, flare, touchdown, and (in some installations) rollout phases of landing without the pilot manually controlling the flight controls. It uses the autopilot, autothrottle, flight director, and precision guidance signals (typically an ILS Category II or III) to control pitch, roll, , and down to and onto the runway.