An automatic flight control system is described as dumb and dutiful. The success of the autopilot depends on the knowledge of the actual human pilot. Autopilot isn't as "auto" as you might think. It lets a pilot fly without white-knuckling the controls. Like a polar bear, autopilot functions through a negative feedback loop.

The video incorrectly states the direction in which single-axis autopilot guides the plane. The single-axis autopilot keeps the wings parallel to the ground, not perpendicular. Insider regrets the error.

MORE ON PLANES:
What Happens When A Bird Flies Into A Plane Engine 
https://youtu.be/p2Fyr6BWKbo
Why You Can't Fly A Plane In Space 
https://youtu.be/7uAjbinCh8o
Why Jets Leave White Trails In The Sky 
https://youtu.be/0yE-AU8kNv4

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How Does Autopilot Actually Work?