Garmin GFC 600H Maintenance Manual page 66

Annunciated
Fault
PFT PFT will not pass.
• Loss of attitude data
(includes AHRS monitor and
attitudes outside the engage
FCS FAIL limits).
• Servos Failure.
(FCS LED –
• FCS DISC switch in an
Red)
invalid state.
• Post-Install Calibration not
complete.
ADC FAIL Air Data inputs have failed.
• Invalid attitude data (includes
AHRS monitor and attitudes
outside the engage limits).
• Air Data inputs have failed.
LMTQ FAIL
• Servos Failure.
• FCS DISC and/or FTR switch
in an invalid state.
FTR FTR switch stuck.
190-02081-03
Rev. 3
Possible Cause
GFC 600H HFCS Part 27 STC Maintenance Manual
Corrective Action
• Ensure the GFS 83 servo strapping for the
configured control axis is correct.
• Ensure yaw control linkages and servo
connections are secure without play.
• Ensure all post-install calibration procedures
have been run and passed for the
GMC 605H, GFS 83, and GSU 75H/
GMU 44( ).
• Power cycle the GFC 600H FCS by cycling
the FCS circuit breaker.
• Ensure the GMC 605H, GFS 83, GSU 75H,
and GMU 44( ) connectors are securely
mated to the units.
• Ensure wiring is correct.
• Verify wiring of FCS DISC and
• FTR from circuit breaker to switch to the GMC
605H and GFS 83.
• Troubleshoot the GSU 75H and GMU 44( ) in
accordance with Section 5.3.
• Contact Garmin.
• Ensure the GMC 605H and GSU 75H
connectors are securely mated to the units.
• Ensure wiring is correct.
• Ensure the pitot static system is free of debris
and obstructions.
• Troubleshoot the GSU 75H and GMU 44( ) in
accordance with Section 5.3.
• Power cycle the GFC 600H FCS by cycling
the FCS circuit breaker.
• Ensure the GMC 605H, GFS 83, GSU 75H,
and GMU 44( ) connectors are securely
mated to the units.
• Ensure wiring is correct.
• Ensure the FCS DISC and FTR switches on
cyclic are not stuck or shorted.
• Verify wiring of FCS DISC and FTR from
circuit breaker to switch to the GMC 605H and
GFS 83.
• Troubleshoot the GSU 75H and GMU 44( ) in
accordance with Section 5.3.
• Contact Garmin.
• Ensure the FTR switch on cyclic is not stuck
or shorted.
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