G1000 Nav III Line Maintenance Manual
Page 2-57
190-00352-00
Rev.
L
2.5.3
Common Alerts
Message Cause
Solutions
AHRS TAS – AHRS not
receiving airspeed.
The GRS 77 is not receiving
airspeed information from
the GDC 74A.
•
Check GRS/GDC interconnect
•
Replace the GDC 74A with a known
good unit:
o
If problem does not persist, replace
the GRS 77.
AHRS GPS – AHRS using
backup GPS source.
The GRS 77 is using a
backup GPS source.
AHRS GPS – AHRS not
receiving backup GPS
information.
The GRS 77 is not receiving
backup GPS information
from either GIA 63/GIA 63W.
AHRS GPS – AHRS operating
exclusively in no-GPS mode.
The GRS 77 is operating in
the absence of GPS.
AHRS GPS – AHRS not
receiving any GPS information.
The GRS 77 is not receiving
GPS data from the GPS
receivers.
•
Ensure that a cell phone or a device
using cell phone technology is not
turned on (even in a monitoring state) in
the cabin.
•
Check GPS status for GIA 1 and 2 on
MFD - AUX GPS STATUS page. If one
or both GPS receivers cannot aquire a
position lock, see Section 2.4.3 for GPS
troubleshooting.
•
See Section 2.1.5.2 for data path
troubleshooting.
•
Replace the GRS 77.
AHRS Service – AHRS magnetic
field model needs updated.
The AHRS magnetic field
model has expired.
•
Reference Garmin SB 0533 for update
instructions.
MANIFEST-GRS1 software
mismatch. Communication
Halted.
The system has detected an
incorrect software version
loaded in GRS 77 or the
GMU 44.
•
Load correct software version in the
GRS 77 and GMU 44.
2.5.4
Other GRS 77/ GMU44 Alerts
Message Cause
Solutions
Calibrate AHRS/MAG
The GRS77 is not
communicating with the
configuration module or the
configuration module is
defective
o
Inspect the configuration module
located in the GRS77 connector
back shell for broken pins or
smashed wires. Disconnect and
reconnect configuration module
connector. If problem persists
replace configuration module.
Summary of Contents for G1000 NAV III
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