Garmin Cessna Caravan G1000, Line Maintenance Manual

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out of date.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