What are the limitations of a typical autopilot in a light airplane and when should you disengage it?

• A. Autopilot can give a false sense of precision and may fail; disengage during critical phases (takeoff, approach, landing) and hand-fly as required
• B. Autopilot never fails and should be used during landing
• C. Autopilot keeps aircraft perfectly stable during all phases
• D. Autopilot is required for all flight in light aircraft

Answer: (A)

Autopilots in light airplanes are helpful but not foolproof; they can give a false sense of precision and may fail or behave unexpectedly. They rely on sensors and actuators, and unexpected conditions such as turbulence, wind gusts, or sensor faults can lead to surprising or unsafe responses. Because of that, you shouldn’t trust the autopilot during the phases where you must have immediate, hands-on control to manage energy, attitude, and precise flight path.

Disengage during takeoff to ensure you’ve got direct control from the moment you rotate and climb, and disengage during approach and landing so you can manually manage descent rate, airspeed, and configuration for a safe touchdown. If you’re ever in doubt, or the system isn’t behaving as you expect, take over and hand-fly. You can use the autopilot to reduce workload in steady, non-critical parts of flight, but always stay prepared to fly manually.