Flight Director, Autopilot Systems

Question 1

Automatic Flight Control System (AFCS)

Answer 1

• AKA autopilot system

Question 2

Function of a basic Automatic Flight Control System (AFCS)

Answer 2

• Light GA aircraft capable of single-pilot IFR operation will most likely have a simple autopilot equipped to relieve the demand from the pilot.

Question 3

Single axis system - Roll only (auto pilot)

Answer 3

Only allows for heading to be maintain by the autopilot. Cannot hold pitch or attitude.

Question 4

Two axis system - Roll and Pitch

Answer 4

• Allows for attitude and heading to be maintained by the autopilot. More complex types have navigation tracking and instrument approach capabilities.

Question 5

Operation of a basic Automatic Flight Control System (AFCS)

Answer 5

Autopilot detects any difference between the desired and actual flight conditions and corrects them by adjusting roll, pitch, and trim controls.

• Small aircraft - electric motor to move control surfaces
• Larger aircraft - hydraulic actuators connected to control surfaces

Question 6

Limitations and cautions of a Automatic Flight Control system (AFCS)

Answer 6

• Pre-flight checks - check the correct functioning of the autopilot on the ground.
• Disconnected for take off and landing
• Requires monitoring - always note what mode you have selected by checking the annunciation panel. Do not rely on autopilot.