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.
Plain English
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.
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.
Why Pilots Care
It reduces workload on long flights but can mask developing bank errors if the pilot stops cross-checking instruments.
Intuition Check
Do not assume a wing leveler is a full autopilot. It mainly helps keep the wings level; it does not make all flying decisions for the pilot.
Example Sentence 1
After trimming for cruise, the pilot engaged the wing leveler so they could fold the chart without the airplane drifting into a bank.
Example Sentence 2
During the checkride the examiner asked the applicant to demonstrate disengaging the wing leveler before entering a turn.