G1000 Supplemental Maintenance Manual
Page 5-25
Textron Nav III Series
Revision 3
190-02128-04
Calibration Procedure E: Magnetometer Interference Test
A magnetometer interference test is available for troubleshooting and/or verifying a magnetically
‘clean’ installation of the GMU 44. This test exercises various devices on the aircraft that could
potentially affect the magnetic field as measured by the GMU 44.
NOTE
This test is used to validate that no electronic device or magnetized components
produce a magnetic field sufficient to interfere with the operation of the GMU 44
magnetometer. It is highly recommended that this test be performed after
installation or maintenance of electrical components on the aircraft and/or for
troubleshooting the GMU 44.
Figure 5-5, Magnetometer Interference Test
1. Initiate the AHRS magnetometer interference test procedure by performing the following
steps:
2. On the PFD, enter Configuration Mode and go to GRS/GMU Calibration page as shown
in Figure 5-5.
3. This page is protected and requires a keystroke password to perform this test. Press the
following softkeys in sequence: (as counted from left to right on lower bezel of MFD)
•
softkey 9
•
softkey 10
•
softkey 11
•
softkey 12
4. Select MAG INTERFERENCE TEST and press the PFD ENT key.
5. Follow the checklist items displayed on the PFD, and press the ENT key as each one is
completed or confirmed.
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