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Page 4-76 LMM for the Kodiak 100
190-02102-00 Rev.4
4.7.8.2 GRS 79 System Messages
Table 4-12 lists GRS 79 related system messages, possible causes, and recommended
actions.
If necessary, retrieve log from CMC Diagnostic Folder and provide it to the
OEM or Garmin for assistance with further troubleshooting.
Table 4-12. GRS 79 System Messages
System Message Cause Recommended Actions
AHRS MAG DB AHRS magnetic model
database version
mismatch.
• Update the magnetic field
model.
AHRS1 CAL AHRS1 calibration error. • Calibrate the AHRS per
Section 7.6.
AHRS1 CONFIG AHRS1 configuration
error.
• Reload configuration to the
AHRS.
• If the fault persists, check
the configuration module
wires for faults and replace
if necessary.
• If the fault persists, replace
the master configuration
module.
• If the message persists,
replace the GRS.
AHRS1 GPS AHRS1 using the
backup GPS path. The
primary GPS path has
failed.
• Ensure no device using cell
phone, Wi-Fi, or Bluetooth
technology is turned on
(even in a monitoring state)
in the aircraft cabin.
• Check the GPS status for
GIA1 and GIA2 on the MFD
GPS Status page.
• If a GPS receiver cannot
acquire a position lock,
troubleshoot the GPS.
• If the fault persists, replace
the GIA.
• If the fault persists, replace
the GRS.
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