Garmin G3X Touch Pilot's Manual page 322

AFCS
AFCS AND YAW DAMPER OPERATION
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.
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. Torque values are set at installation. This allows
the servos to be overridden in case of an emergency. Non-Garmin autopilot systems
may not allow servos to be overridden, consult the non-Garmin autopilot documents
for limitations.
p a
itCh XiS anD
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.
r a
oll XiS
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.
y a
aw XiS
The optional 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.
302
t
riM
Garmin G3X Touch Pilot's Guide 190-01754-00 Rev. L