Garmin G1000 Line Maintenance Manual page 162

Uncontrolled if Printed
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Table 4-12. GRS 79 System Messages (Continued)
System Message
AHRS1 SERVICE
AHRS1 SRVC
AHRS1 TAS
AHRS2 CAL
AHRS2 CONFIG
AHRS2 GPS
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Page 4-78
Cause
A failure has been
detected in ADHARS1.
The ADHARS1
magnetic-field model is
out of date.
The GRS 79 is not
computing valid
airspeed.
AHRS2 calibration error.
AHRS2 configuration
error.
AHRS2 using the
backup GPS path. The
primary GPS path has
failed.
Recommended Actions
• Replace the GRS.
• Update the magnetic-field
model.
• Check the pneumatic
plumbing.
• If the problem persists,
replace the GSU.
• Calibrate the AHRS per
Section 7.6.
• 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.
• 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.
LMM for the Kodiak 100
190-02102-00 Rev.4