GFC 600 AFCS Part 23 AML STC Maintenance Manual Page 11
190-01938-00 Revision 13
3. Control and Operation
NOTE: For certain models, circuit breakers or switches may be labeled with slightly different
nomenclature, though the function will be identical. Refer to the Master Drawing List 005-
01009-01 for model-specific information that contains alternate nomenclature (if any).
3.1 GMC 605
The GMC 605 provides GFC 600 AFCS mode selections and annunciations. Refer to the GFC
600 Pilot’s Guide, 190-01488-00, for operational characteristics of the system.
3.2 Autopilot Disconnect/Trim Interrupt Switch
An AP DISC/TRIM INT switch is provided on the pilot’s flight controls to allow for manual
disconnect of the autopilot system and to interrupt the electric pitch trim and yaw trim (if
installed). Pressing and holding the AP DISC/TRIM INT switch for more than 5 seconds will turn
off the Electronic Stability and Protection (ESP) feature.
In certain airframes, a disconnect switch may be provided on the copilot’s flight controls. The
functionality of the switch is identical to that on the pilot’s flight controls.
3.3 Pitch Trim Switch
If the GFC 600 AFCS includes a pitch trim servo, a TRIM switch is provided on the pilot’s flight
controls to allow for manual electric control of the pitch trim system. Both halves of the TRIM
switch must be pushed simultaneously for the pitch trim servo to engage and run in the
requested direction. If the autopilot is engaged and the TRIM switch is pressed, the autopilot
will disengage.
In certain airframes, a trim switch may be provided on the copilot’s flight controls. The
functionality of the switch is identical to that on the pilot’s flight controls.
3.4 Control Wheel Steering (CWS) Switch
A CWS switch is provided on the pilot’s flight controls. Pressing the CWS switch will disengage
the autopilot servos from the flight control system for as long as the switch is pressed. The
autopilot servos will re-engage at the current flight attitude when the switch is released.
In certain airframes, a CWS switch may be provided on the copilot’s flight controls. The
functionality of the switch is identical to that on the pilot’s flight controls.
3.5 Go Around (GA) Switch
A GO AROUND switch is provided for engagement of the go around mode. When go around
mode is engaged, the autopilot engages in wings level roll attitude and nose up pitch attitude.
The pitch attitude is dependent on the aircraft model. Refer to the appropriate GFC 600 AFCS
Airplane Flight Manual Supplement for the go around pitch attitude. Refer to the appropriate
model-specific installation manual addendum (190-01937-XX) for switch installation location.
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