Autopilot And Yaw Damper Operation; Flight Control; Pitch Axis And Trim - Garmin G5 Pilot's Manual

AFCS
When configured as a backup unit for a G3X/G3X Touch system:
• The G5 supports the following modes: LVL, PIT, ROL, HDG, TRK (if available on
the G3X), GPS, VS, VNAV, IAS, ALT, ALTS, TO, GA, and GP.
• GP mode requires ARINC 429 data from an IFR navigator.
• TRK mode is selected using the HDG Key on the GMC 305/307, or TRK Key on
the GMC 507.

3.1.2 AUTOPILOT AND YAW DAMPER OPERATION

The autopilot servos and optional yaw damper operate the flight control surfaces
to provide automatic flight control. The autopilot controls the aircraft pitch and roll
attitudes following commands received from the flight director. Pitch, Roll, and Yaw
(if installed) autotrim provides trim commands to each servo to relieve any sustained
effort required by the servo(s). Autopilot operation is independent of the optional yaw
damper.
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.

3.1.3 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.

3.1.4 PITCH AXIS AND TRIM

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.
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G5 Electronic Flight Instrument Pilot's Guide for Non-Certified Aircraft 190-02072-00 Rev. J