Maintenance Manual
190-02472-02
G3X Touch EFIS Part 23 AML STC
Revision 2
Page 41
5.4.4 Magnetometer Interference Test
NOTE
The Magnetic Interference Test is only required for initial installation verification. This test should also be
repeated to verify all subsequent electrical changes associated with devices within 10 feet of the GMU
magnetometer. Such changes include, but are not limited to, wiring, shielding, or grounding changes to
any light, strobe, beacon, or other electrical device located in the vicinity of the GMU magnetometer unit.
Likewise, this test should also be repeated to verify all subsequent changes to materials within 10 feet of
the GMU magnetometer. Such changes include but are not limited to addition, removal, or modification
of ferrous or electrically conductive materials located in the same wing as a GMU magnetometer unit.
This procedure validates that no electronic device is interfering with the operation of the GMU
magnetometer which directly impacts the determination of attitude and heading by the GSU 25D. The
ADAHRS Unit Orientation and Pitch/Roll Offset Compensation are not
required prior to this execution of
this procedure. A sequence of activities to be performed during a magnetometer interference test is
shown in Table 5-7 below. This is an example to help guide a technician through an aircraft’s functions
that may create interference with an installed GMU 11 magnetometer.
CAUTION
The real time readout displayed during the interference test is only valid for the location of the GMU
when the test was initiated. If using this procedure to evaluate multiple mounting locations, the test must
be started over for each location, failure to do so could provide incorrect test results.
1. Power on PFD in configuration mode (Section 3.2.2).
2. Select the Magnetometer Calibration Page.
3. Select
Magnetic
Interference Test.
4. Ensure that the aircraft has been properly prepared per the on-screen instructions. See Table 5-7 for
a sample test sequence. Press the Start button to begin the test.
Figure 5-6 – Magnetometer Interference Test On-screen Instructions
5. The actions must be carried out as called for in the prepared test sequence. During calibration, a
real-time value is displayed that represents the current magnetic field strength as a percentage of
the maximum limit.
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