G1000 NXi System Maintenance Manual
Page 204
King Air 300 Series
Revision 1
190-00716-N1
GRS/GSU Alerts
Failure Message
Cause
Solutions
MANIFEST – GRS1 software
mismatch. Communication
halted.
The system has detected an
incorrect software version loaded
in the specified GRS unit.
Load correct software version.
MANIFEST – GRS2 software
mismatch. Communication
halted.
AHRS1 SERVICE – AHRS1
magnetic-field model needs
update.
The AHRS magnetic field model
should be updated for the
specified unit. Appears on ground
only.
Load updated AHRS magnetic field file.
See Section 4.6.
AHRS2 SERVICE – AHRS2
magnetic-field model needs
update.
GEO LIMITS – AHRS1 too far
north/south, no magnetic
compass.
No magnetic compass information
available due to being too far
north or south.
Operate the aircraft only within the limits
as specified in the G1000 King Air 200
AFMS, listed in Table 1-2
GEO LIMITS – AHRS2 too far
north/south, no magnetic
compass.
AHRS1 TAS – AHRS1 not
receiving airspeed.
The specified GSU 75B, GRS 77,
or GRS 7800 is not receiving
airspeed from the air data card, or
GDC 7400.
•
Check GRS/GDC interconnect for
faults. (Internal fault between the
ADC and AHRS cards in the GSU
75B)
•
Replace the GSU 75B or GDC 7400
•
If problem persists, replace the GSU
75B, GRS 77, or GRS 7800.
AHRS2 TAS – AHRS2 not
receiving airspeed.
AHRS1 GPS – AHRS1 not
receiving backup GPS
information.
The GSU 75B, GRS 77, or GRS
7800 #1 is not receiving backup
GPS information from either GIA
63.
•
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
acquire a position lock, see GPS
troubleshooting section
•
Troubleshoot GIA1/2 –GRS1 wiring
for faults (ref. Failed Path
troubleshooting section).
•
Replace the GRS or GSU #1.
AHRS1 GPS – AHRS1 operating
exclusively in no-GPS mode.
The GSU 75B, GRS 77, or GRS
7800 #1 is operating in the
absence of GPS.
AHRS1 GPS – AHRS1 not
receiving any GPS information.
The GSU 75B, GRS 77, or GRS
7800 #1 is not receiving GPS data
from the GPS receivers.
AHRS1 GPS – AHRS1 using
backup GPS source.
The GSU 75B, GRS 77, or GRS
7800 #1 is using the backup GPS
data path.
AHRS2 GPS – AHRS2 not
receiving backup GPS
information.
The GSU 75B, GRS 77, or GRS
7800 #2 is not receiving backup
GPS information from either GIA
63.
•
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
acquire a position lock, see GPS
troubleshooting section
•
Troubleshoot GIA1/2 – GSU/GRS2
wiring for faults (ref. Failed Path
troubleshooting section).
•
Replace the GRS or GSU #2.
AHRS2 GPS – AHRS2 operating
exclusively in no-GPS mode.
The GSU 75B, GRS 77, or GRS
7800 #2 is operating in the
absence of GPS.
AHRS2 GPS – AHRS2 not
receiving any GPS information.
The GSU 75B, GRS 77, or GRS
7800 #2 is not receiving GPS data
from the GPS receivers.
AHRS2 GPS – AHRS2 using
backup GPS source.
The GSU 75B, GRS 77, or GRS
7800 #2 is using the backup GPS
data path.
AHRS MAG DB – AHRS magnetic
model database version
mismatch.
The G1000 has detected a
magnetic model database version
mismatch.
Load AHRS magnetic model field in both
GSU/GRS units.
Summary of Contents for G1000 NXi
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