What AFCS system makes inputs that cannot be seen in the flight controls?

• A. SAS
• B. Autopilot
• C. Beep Trim
• D. SAS/AP Cut Switch

Answer: (A)

Stability augmentation is about automatic, small corrections that stabilize the airplane without you actively commanding them. The Stabilization Augmentation System constantly senses how the aircraft is moving and makes tiny deflections of the control surfaces to dampen disturbances and keep the aircraft on course. Because these adjustments are small and routine, they aren’t felt as deliberate pilot inputs on the stick or yoke, so the corrections seem “invisible” in the flight controls.

Autopilot, by contrast, takes control to fly along a set path or hold a specific attitude, and its movements are usually noticeable as the aircraft steers to meet those commands. The other option isn’t a direct stabilizing function you’d feel in normal flight, and the switch to cut SAS/AP merely disables them. So the system that makes inputs you don’t visibly see in the controls is the stabilization augmentation system.