Instruction Manual
G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air Page 5-71
190-00915-01 Revision 9
5.15.2 GRS Alerts
Failure Message Cause Solutions
MANIFEST – GRS1 software
mismatch. Communication
halted.
The system has detected an
incorrect software version loaded
in the specified GRS 77 or GRS
7800.
• Load correct software version. See
Section 3.9 for the Software Load
Procedure.
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/GFC
700, King Air 200/B200 AFMS, listed
in Table 1-3
GEO LIMITS – AHRS2 too far
north/south, no magnetic
compass.
AHRS1 TAS – AHRS1 not
receiving airspeed.
The specified GRS 77 or GRS
7800 is not receiving airspeed
from the GDC 74B/GDC 7400.
• Check GRS/GDC interconnect for
faults.
• Replace the GDC 74B/GDC 7400
• If problem persists, replace the GRS
77 or GRS 7800.
AHRS2 TAS – AHRS2 not
receiving airspeed.
AHRS1 GPS – AHRS1 not
receiving backup GPS
information.
The 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 77 or GRS 7800
#1.
AHRS1 GPS – AHRS1 operating
exclusively in no-GPS mode.
The GRS 77 or GRS 7800 #1 is
operating in the absence of GPS.
AHRS1 GPS – AHRS1 not
receiving any GPS information.
The GRS 77 or GRS 7800 #1 is
not receiving GPS data from the
GPS receivers.
AHRS1 GPS – AHRS1 using
backup GPS source.
The GRS 77 or GRS 7800 #1 is
using the backup GPS data path.
AHRS2 GPS – AHRS2 not
receiving backup GPS
information.
The 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 –GRS2 wiring
for faults (ref. Failed Path
troubleshooting section).
• Replace the GRS 77 or GRS 7800
#2
AHRS2 GPS – AHRS2 operating
exclusively in no-GPS mode.
The GRS 77 or GRS 7800 #2 is
operating in the absence of GPS.
AHRS2 GPS – AHRS2 not
receiving any GPS information.
The GRS 77 or GRS 7800 #2 is
not receiving GPS data from the
GPS receivers.
AHRS2 GPS – AHRS2 using
backup GPS source.
The 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 GRS units.