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Page 7-18 G1000 System Maintenance Manual
Rev. A 190-00903-00
Procedure E: Magnetometer Interference Test
This procedure validates that no electronic device is interfering with the operation of the
GMU 44 magnetometer which directly impacts the determination of attitude and heading by the
GRS 77 AHRS. Calibration Procedures A-1 through D are not required prior to this execution of
this procedure.
Figure 7-6. Magnetometer Interference
1.
Enter Configuration Mode and go to GRS/GMU Calibration page as shown in Figure 7-6.
2. This page is protected and requires a keystroke password to perform this test. Press the
following softkeys in sequence: 9, 10, 11, and 12.
3. Select GRS unit and press the ENT key.
4. Select MAG INTERFERENCE TEST and press the ENT key.
5. Follow the checklist items displayed on the PFD, and press the ENT key as each one is
completed or confirmed.
NOTE
The 3
rd
item on the checklist instructs the operator to “prepare a detailed
test sequence with precise start and stop times for exercising all electronic
devices”. Only the electronic devices that are likely to affect the operation
of the GMU 44 magnetometer need be included in the test sequence. The
list of relevant electronic devices will vary from aircraft to aircraft. An
example of an appropriate test sequence is given in Table 7-2.
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