Garmin Software Version 0321.23 Manual Pagina 36

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Page 2-10 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
2.4.1 GFC 700 Electrical Aspects
The wiring and switches used by the GFC 700 are provisioned by Diamond under OAM 40-226, and are
not included in the Garmin GFC 700 STC design. In general, the pitch and pitch trim servos are wired in
parallel to both GIA 63s and use the RS-485 serial protocol to communicate while the pitch servo has its
own line to both GIAs. See the Diamond wiring diagrams listed in Table 1-2 for more details on wiring.
The Diamond provisions also include the following switches:
AP DISC Switch
There are two large red AP DISC switches located on the pilot and copilot control sticks. When normally
closed, +28 VDC is allowed to pass through to the SERVO ENABLE pins of each servo, allowing the
Autopilot and servos to operate. When pushed, the switches break the +28VDC source and the Autopilot
disconnects and takes the servos offline.
CWS Switch
A control wheel steering switch is located on the pilot’s control stick. When pressed, this switch activates
CWS mode. The Autopilot, if engaged, is temporarily disengaged, and the Flight Director command bars
immediately synchronize to the current aircraft pitch and roll attitude. When released, the Autopilot will
re-engage (if previously engaged) and the Flight Director will orient itself to the last known pitch and roll
reference established during CWS mode. This allows the pilot to hand fly the aircraft when desired and
also allows the pilot to reestablish a desired aircraft flight attitude for the Autopilot to maintain.
MET Switch
See previous functional description of MET.
GA Switch
A Go-Around switch is installed within the engine throttle knob and activates the GA Flight Director
mode. During this mode, the Autopilot disengages (if engaged) and the Flight Director displays a 7° pitch
up nose attitude for reference during a missed approach or go-around procedure.
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