Garmin G3X Installation Manual page 469

31.4.3.4 Calibration Procedure C: Magnetometer Interference Test
NOTE
Calibration Procedure C 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 22 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 22 unit. Likewise, this test should also be
repeated to verify all subsequent changes to materials within 10.0 feet of the GMU 22.
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 22 unit. This
procedure validates that no electronic device is interfering with the operation of the
GMU 22 magnetometer which directly impacts the determination of attitude and heading
by the GSU 25/GSU 73 AHRS. Calibration Procedures A and B are not required prior to
this execution of this procedure.
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.
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 AHRS Page (if needed).
3. Ensure that all the required status boxes are checked
Joystick to select which AHRS (1, 2 or 3) is being configured.
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AA
(Table 31-2 and Table 31-3). Use the FMS
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