Garmin GFC 600H Maintenance Manual page 70

Annunciated Fault
TEST FAILED:
RESULT NOT
SAVED
TEST FAILED: CRC
FAILED
TEST FAILED:
• MAG-FIELD
RETURNED
BAD RESULTS
• HORIZONTAL
MAG FIELD
TOO SMALL
• PHASE I / II
NOT
COMPLETED
FAST ENOUGH
• TOO MANY
STATIONS
AROUND
COMPASS
ROSE
• NOT ENOUGH
N,E,S,W
STATION DATA
• COMPUTED
MAGNETIC
OFFSETS ARE
TOO LARGE
• SITE DOESN'T
HAVE
UNIFORM
MAGNETIC
FIELD
• SITE MAG
FIELD
DIFFERENT
FROM IGRF
MODEL
190-02081-03
Rev. 3
Possible Cause
The GMC 605H has experienced
an internal non-volatile memory
error.
The GMC 605H received invalid
data.
• GMC is not receiving valid
GPS, air data, and/or
magnetometer data.
• Rotorcraft is not in a
magnetically clean area.
• Post-install calibrations were
not completed.
• Replace the GMC 605H configuration
module. Refer to Section 6.8 for
removal and replacement of
configuration module.
• Ensure that the configuration settings
match those retained with the rotorcraft
records (Appendix A).
• Ensure a valid GPS and Air Data
source is available to the GMC 605H.
• Ensure the GMC 605H, GFS 83,
GSU 75H, and GMU 44( ) connectors
are securely mated to the units.
• Ensure wiring is correct.
• Ensure that the configuration settings
match those retained with the rotorcraft
records (Appendix A).
• Ensure a valid GPS and Air Data
source is available to the GMC 605H.
• Ensure the GMC 605H, GFS 83, GSU
75H and GMU 44( ) connectors are
securely mated to the units.
• Ensure wiring is correct.
• Ensure rotorcraft is in an area free of
magnetic interference and away from
ferrous metal objects.
• Ensure all calibration procedures were
completed in order. Refer to
Section 7.7 for required post-install
procedures.
GFC 600H HFCS Part 27 STC Maintenance Manual
Corrective Action
Page 5-9