Gmu 44 Magnetometer - Garmin G1000 Nxi System Maintenance Manual

GMU 44 Magnetometer

Original GMU 44 is Reinstalled
If the original GMU 44 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. Continue to the GRS/GMU Test Section 7.10.5.
Original GMU 44 is Installed in Opposite Location for Troubleshooting
If the original GMU #1 and GMU #2 are installed in opposite locations (GMU #1 and GMU #2 in
opposite unit racks), no software loading is required. However, performing the Magnetometer
Calibration Procedure is required. Continue to the GRS/GMU Magnetic Calibration Section
7.10.3.
New, Repaired or Exchange GMU 44 is Installed
If a new, repaired or exchange GMU 44 is installed, then software must be loaded.
LRU Replacement Procedure GMU1 or GMU2
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 GMU1 or GMU2, 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.
15. If red-Xs or system alerts are present, troubleshoot as necessary using Section 5 or re-
load the system using the legacy method in Section 7.9.2.
16. If there are no red-Xs or system alerts, continue to Section 7.10.
Legacy Replacement Procedure GMU1 or GMU2 (Alternate Method)
1. Insert the software loader card in the top slot of PFD1.
2. Power on PFD2, MFD, and PFD1 in configuration mode.
3. Select NO when "Do you want to update system files" is displayed on the screen of
PFD1.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 307
Revision 1