190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page H-29
H.4.4.2 Magnetometer Interference Test
NOTE
The Magnetometer Inteference Test is only required for initial installation verification.
This test should also be repeated to verify all subsequent electrical changes associated
with devices within 10.0 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 unit. Likewise, this test should also be
repeated to verify all subsequent changes to materials within 10.0 feet of the GMU. 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 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 25/GSU 73 ADAHRS.
CAUTION
The real time display 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.
NOTE
Garmin recommends this test be performed at least once every 12 months.
1. Enter configuration mode by holding down the left-hand softkey while powering on the PFD 1
display (if needed).
2. Use the FMS Joystick to select the MAG Page (if needed).
3. Make sure that all the required status boxes are checked (Table H-5
and Table H-6). Use the FMS
Joystick to select which Magnetometer (1, 2 or 3) is being configured.
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