Flight Control; Pitch Axis And Trim; Roll Axis; Yaw Axis - Garmin G5 Pilot's Manual

Electronic flight instrument for non-certified aircraft

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AFCS

The optional yaw damper reduces Dutch roll tendencies, coordinates turns, and

provides a steady force to maintain directional trim. It can operate independently

of the autopilot and may be used during normal hand-flight maneuvers. Yaw rate

commands are limited to 6 deg/sec by the yaw damper.

3.1.2 FLIGHT CONTROL

Pitch and roll commands are provided to the servos based on the active flight

director modes. Yaw commands are provided by the yaw servo. Servo motor control

limits the maximum servo speed and torque. This allows the servos to be overridden

in case of an emergency.

The autopilot pitch axis uses pitch rate to stabilize the aircraft pitch attitude during

flight director maneuvers. Flight director pitch commands are rate and attitude-limited,

combined with pitch damper control, and sent to the pitch servo motor. The pitch servo

measures the output effort (torque) and optionally provides this signal to the pitch trim

motor. The pitch servo commands the pitch trim motor to reduce the average pitch

servo effort.

The autopilot roll axis uses roll rate to stabilize aircraft roll attitude during flight

director maneuvers. The flight director roll commands are rate- and attitude-limited,

combined with roll damper control, and sent to the roll servo motor.

The yaw damper uses yaw rate and roll attitude to dampen the aircraft's natural

Dutch roll response. It also uses lateral acceleration to coordinate turns and reduce

or eliminate the need for the pilot to use rudder pedal force to maintain coordinated

flight during climbs and descents.

G5 Electronic Flight Instrument Pilot's Guide for Non-Certified Aircraft

190-02072-00 Rev. G

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