Magnetometer Interference - Garmin G1000 NAV III Line Maintenance Manual

4.4.5.4 Procedure E: Magnetometer Interference Test
Calibration Procedure E is required for initial installation verification and should
be included as part of the certification data. Furthermore, Calibration Procedure
E should be performed once every 12 months on at least one production aircraft
for every airframe type or model equipped with the G1000 system. 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.
1. Initiate the AHRS magnetometer interference test procedure by performing the following steps:
a) Enter Configuration Mode and go to GRS/GMU Calibration page as shown in Figure 4-9.
b) This page is protected and requires a keystroke password to perform this test. Press the following
softkeys in sequence:
i) softkey 9
ii) softkey 10
iii) softkey 11
iv) softkey 12
c) Select MAG INTERFERENCE TEST and press the ENT key.
d) Follow the checklist items displayed on the PFD, and press the ENT key as each one is completed
or confirmed.
G1000 Nav III Line Maintenance Manual
190-00352-00
Figure 4-9. Magnetometer Interference
NOTE
Page 4-27
Rev. L