Gmu 44 Magnetometer - Garmin G1000 Nxi System Maintenance Manual

5. Connect the connector to the GRS 7800.
6. Calibrate and test the GRS 7800 according to Section 7.10
GSU 75B Removal:
1. Gain access to the forward avionics compartment in the nose of the aircraft.
2. Disconnect the ADAHRS connector.
3. Disconnect the pitot and static lines.
4. Turn each retention screw counterclockwise until they disconnect from the remote rack.
5. Gently slide the unit from the remote rack. Do NOT loosen the remote rack hardware
fastening it to the avionics shelf or the GSU 75B must be re-calibrated per Section 7.10)
GSU 75B Installation:
1. Visually inspect the connector to ensure there are no bent or damaged pins. Also
inspect the pitot and static fittings for damage. Repair any damage.
2. Place the GSU 75B unit on the remote rack and slide the unit back until the feet are fully
engaged with the remote rack.
3. Push down and turn each retention screw clockwise. Torque each retention screw to
15-20 in-lbs.
4. Connect the pitot and static lines.
5. Connect the ADAHRS connector to the unit.
6. Calibrate and test the GSU 75B per Section 7.10.

GMU 44 Magnetometer

The GMU 44 magnetometers may be located in the tailcone or in the horizontal
stabilizer.
Always use a non-magnetic Phillips screwdriver when removing or installing all screws
near the magnetometers.
Reference the "Magnetometer Install" and "Wire Harness Installation, Tail" drawings
listed in Table 1-1 for more details.
For Tailcone Location:
Removal:
1. Disconnect electrical wiring harnesses and remove the tailcone.
2. Remove three screws connecting the unit to the aircraft mounting bracket.
3. Remove the cable tie attaching the magnetometer pigtail harness to the shelf.
Reinstallation:
1. Visually inspect the connectors to ensure there are no bent or damaged pins. Repair
any damage.
2. Fasten the GMU to the aircraft mounting bracket.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
NOTES
Page 234
Revision 1