190-02081-03
GFC 600H HFCS Part 27 STC Maintenance Manual
Rev. 3
Page 5-3
A System Message is
displayed on the GMC 605H
or GDU (if installed).
• Troubleshoot the alert message using Table 5-3.
R, Y, or P servo annunciations
are displaying out of detent
• Verify the friction lock is set to its lowest position. The system may
be detecting a hands on condition due to excessive friction on the
controls.
• Verify that each AHRS (GSU 75H or GRS 79H and GMC 605H)
were calibrated at the same time and the aircraft was level at the
time of calibration.
• Press FTR. This will reset the reference to the current attitude. This
should not be used as an initial troubleshooting step as it may not
resolve the primary reason for the out of detent annunciation.
No FCS Data (On GDU)
• GDU not receiving data from the GMC.
• Verify GMC is powered on.
• Verify wiring between GMC and GDU.
• If problem persists, contact Garmin for assistance.
Servo information is not being
reported in Configuration
mode
• Confirm proper CAN termination at the ends of CAN BUS 1 and
CAN BUS 2.
GMC 605H display does not
show any status in Normal
mode and the system will not
engage
• Reload software and ensure there are no software failures.
• Contact Garmin if issue persists.
Symptom
Recommended Action