Plain English Meaning

A basic autopilot feature that keeps the wings flat for you, so the airplane doesn't slowly roll into a turn while you're busy with something else.

Full Definition

A simplified autopilot system, or autopilot mode, that automatically holds the airplane's wings level by sensing bank angle and applying aileron input to return the aircraft to a wings-level attitude. It controls roll only and does not manage pitch, heading, or altitude.

Context Anchor

You may see this term in airplane handling and common-error discussions, especially where a pilot relies too much on automation instead of actively flying the airplane.