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.
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