Garmin G1000 System Maintenance Manual page 217

5.15.2 GRS Alerts
Failure Message
MANIFEST – GRS1 software
mismatch. Communication
halted.
MANIFEST – GRS2 software
mismatch. Communication
halted.
AHRS1 SERVICE – AHRS1
magnetic-field model needs
update.
AHRS2 SERVICE – AHRS2
magnetic-field model needs
update.
GEO LIMITS – AHRS1 too far
north/south, no magnetic
compass.
GEO LIMITS – AHRS2 too far
north/south, no magnetic
compass.
AHRS1 TAS – AHRS1 not
receiving airspeed.
AHRS2 TAS – AHRS2 not
receiving airspeed.
AHRS1 GPS – AHRS1 not
receiving backup GPS
information.
AHRS1 GPS – AHRS1 operating
exclusively in no-GPS mode.
AHRS1 GPS – AHRS1 not
receiving any GPS information.
AHRS1 GPS – AHRS1 using
backup GPS source.
AHRS2 GPS – AHRS2 not
receiving backup GPS
information.
AHRS2 GPS – AHRS2 operating
exclusively in no-GPS mode.
AHRS2 GPS – AHRS2 not
receiving any GPS information.
AHRS2 GPS – AHRS2 using
backup GPS source.
AHRS MAG DB – AHRS magnetic
model database version
mismatch.
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01
Cause
The system has detected an
incorrect software version loaded
in the specified GRS 77 or GRS
7800.
The AHRS magnetic field model
should be updated for the
specified unit. Appears on ground
only.
No magnetic compass information
available due to being too far
north or south.
The specified GRS 77 or GRS
7800 is not receiving airspeed
from the GDC 7400.
The GRS 77 or GRS 7800 #1 is
not receiving backup GPS
information from either GIA 63.
The GRS 77 or GRS 7800 #1 is
operating in the absence of GPS.
The GRS 77 or GRS 7800 #1 is
not receiving GPS data from the
GPS receivers.
The GRS 77 or GRS 7800 #1 is
using the backup GPS data path.
The GRS 77 or GRS 7800 #2 is
not receiving backup GPS
information from either GIA 63.
The GRS 77 or GRS 7800 #2 is
operating in the absence of GPS.
The GRS 77 or GRS 7800 #2 is
not receiving GPS data from the
GPS receivers.
The GRS 77 or GRS 7800 #2 is
using the backup GPS data path.
The G1000 has detected a
magnetic model database version
mismatch.
Solutions
•
Load correct software version. See
Section 3.9 for the Software Load
Procedure.
•
Load updated AHRS magnetic field
file. See Section 4.6.
•
Operate the aircraft only within the
limits as specified in the G1000/GFC
700, King Air 300/B300 AFMS, listed
in Table 1-3
•
Check GRS/GDC interconnect for
faults.
•
Replace the GDC 7400
•
If problem persists, replace the GRS
77 or GRs 7800.
•
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.
•
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
•
Load AHRS magnetic model field in
both GRS units.
Page 5-69
Revision 4