Garmin G1000 Nxi System Maintenance Manual page 248

3. Attach the magnetometer pigtail harness to the shelf with a cable tie
4. Reinstall tailcone and connect the electrical wiring harnesses.
5. Calibrate and test the GMU 44 according to Section 7.10.
For Horizontal Stabilizer Location (left or right side):
Removal:
1. Remove inspection access panel (second from inboard) from lower side of the horizontal
stabilizer to gain access to the GMU electrical wiring harness.
2. Disconnect GMU pigtail harness from the electrical wiring harness.
3. Remove the screws and flux valve access cover from the upper side of horizontal
stabilizer.
4. Mark the orientation of the GMU adapter plate assembly to the flux valve mounting dish.
5. Remove three screws/washers connecting the GMU adapter plate assembly to the flux
valve mounting dish.
6. Remove three screws connecting the GMU to the GMU adapter plate assembly.
7. If the unit is to be replaced, remove cable ties attaching the phenolic wire guard to the
unit and retain the wire guard and grommet from the pigtail harness.
Reinstallation:
1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair
any damage.
2. Reinstall the three screws attaching the GMU to the GMU adapter plate assembly.
3. If a new GMU is installed, use two MS3367-7-1 cable ties through the retained phenolic
wire guard to secure the guard and connector harness to the GMU.
4. Ensure the MS35489-4 grommet is installed on the unit pigtail harness and secured in
the slot in the aft side of the GMU adapter plate assembly.
5. Use the orientation marks on the GMU adapter plate assembly to align the adapter plate
assembly to the flux mounting dish and reinstall the three screws/washers attaching the
adapter plate.
6. Ensure there is a gap of at least 0.2 inch between the unit pigtail harness and the flux
valve access cover.
7. Reinstall the screws and flux valve access cover on the upper side of horizontal
stabilizer.
8. Connect the GMU pigtail harness to the electrical wiring harness.
9. Reinstall the inspection access panel (second from inboard) on the lower side of the
horizontal stabilizer.
10. Calibrate and test the GMU 44 according to Section 7.10.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Page 235
Revision 1