Garmin G3X Touch, Pilot'S Manual

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Garmin G3X Pilot’s Guide 190-01115-00 Rev. K
303
AFCS
System
Overview
Flight
Instruments
EIS
CNS
Interface
GPS
Navigation
Flight
Planning
Hazar
d
Avoidance
Additional
Featur
es
AFCS
Annun/Alerts
Appendix
Index
9.1 AFCS OPERATION
When a GMC 305 is installed AFCS functionality is distributed across the following
Line Replaceable Units (LRUs):
• GDU 370/375 Display Unit.
• GSU 73/25 ADAHRS Unit • GMC 305 AFCS Mode Control
Unit
• GSA 28 AFCS Pitch/Roll/Yaw
Damper (optional) servos.
The AFCS system can be divided into these main operating functions:
•
Flight Director (FD)
— Flight director operation takes place within GDU
370/375. Flight director commands are displayed on the PFD. The flight director
provides:
– Command Bars showing pitch/roll guidance
– Vertical/lateral mode selection and processing
– Autopilot communication
•
Autopilot (AP)
— Autopilot operation occurs within the pitch, roll, and pitch
servos. It also provides servo monitoring and automatic flight control in response
to flight director steering commands, Air Data and Attitude and Heading Reference
System (ADAHRS) attitude, rate information, and airspeed.
•
Yaw Damper (YD
) — The yaw servo (optional), is self-monitoring and provides
Dutch roll damping and turn coordination in response to yaw rate, roll angle, lateral
acceleration, and airspeed. If installed the YD comes on when the autopilot is engaged
and stays on after disengaging the autopilot. The YD can be turned on/off independent
of the autopilot using the
YD Key
.
• Manual Electric Trim (MET) — Manual electric trim may provide trim capability
for any properly configured axis (pitch, roll, or yaw) when the autopilot is not engaged.