Definition
An integrated set of airborne equipment that automatically controls an aircraft's flight path and attitude. An AFCS typically combines the autopilot, flight director, autothrottle (when fitted), and the sensors and computers that drive them, working together to hold or change heading, altitude, airspeed, and vertical path in response to pilot inputs or programmed flight modes.
Plain English
It is the whole package of systems that lets the airplane fly itself — keeping the wings level, holding an altitude, following a heading, or flying a programmed route — under the pilot's supervision.
Context Anchor
Pilots encounter AFCS information when using the flight director, autopilot controls, and flight displays in airplanes equipped with automated flight features.
Derivation
The name describes the function: 'automatic' (acts without continuous pilot input), 'flight control' (manages the aircraft's path and attitude), 'system' (a coordinated group of components rather than a single device). The word 'system' is the important clue — an AFCS is broader than just the autopilot.
Why Pilots Care
It reduces pilot workload on long flights and during instrument approaches while maintaining precise flight path control.
Intuition Check
AFCS does not mean the airplane is fully flying itself with no pilot responsibility. It means the system can assist with guidance and control when the pilot selects and monitors the correct settings.
Example Sentence 1
Before departure, the crew briefed which AFCS modes they would use for the climb and initial cruise.
Example Sentence 2
With the AFCS coupled to the localizer, the airplane tracked the final approach course automatically.