Grs 77 Or 7800 Ahrs And Gmu 44 Magnetometer - Garmin G1000 Nxi System Maintenance Manual

GRS 77 or 7800 AHRS and GMU 44 Magnetometer

Original GRS is Reinstalled
If the original GRS is reinstalled, then no software loading is required. This does not include
units that were returned for repair as their software and configuration files are deleted during the
repair testing process.
If the GRS rack was not removed or loosened, continue to the GRS/GMU Test Section 7.10.5.
If the GRS rack was removed or loosened, continue to the GRS/GMU Calibration Procedures
Section 7.10.
Original GRS is installed in Opposite Location for Troubleshooting
If the original GRS #1 and GRS #2 are installed in opposite locations (GRS #1 and GRS #2 in
opposite unit racks), no software loading is required.
If the GRS rack(s) was not removed or loosened, continue to the GRS/GMU Test Section
7.10.5.
If the GRS rack(s) was removed or loosened, continue to the GRS/GMU Calibration Procedures
Section 7.10.
New, Repaired or Exchange GRS is Installed
If a new, repaired or exchange GRS is installed, then software must be loaded.
New GRS Configuration Module is Installed
If the GRS configuration module is replaced, no software loading is required. Continue to the
GRS/GMU Calibration Procedures Section 7.10.
LRU Replacement Procedure GRS1 or GRS2
1. Open the MFD, PFD 1 (PRI), PFD 1 (SEC), and PFD 2 circuit breakers.
2. Apply power to the G1000 system by connecting external power to the aircraft to
energize the aircraft and avionics electrical busses.
3. Turn on Avionics electrical busses.
4. Power on PFD2, MFD, and PFD1 in configuration mode.
5. Using the PFD1, scroll to the LRU replacement page.
6. Activate the curser and select GRS1 or GRS2, whichever was replaced in the LRU
dropdown box.
7. Verify all boxes are checked. If they are not checked, press the CHK All softkey.
8. Press the Load softkey.
9. Press ENT to acknowledge the process was complete.
10. Deactivate the curser.
11. Scroll to the Configuration Manager page.
12. Press the CNFM CFG softkey.
13. Select ok when prompted to "Confirm configuration as expected configuration"
14. Power cycle the system. Verify there are no red-Xs or system alerts.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 305
Revision 1