Calibration Procedure D: Magnetometer Calibration; Aircraft Alignment - Garmin G3X Installation Manual

19.3.4 Calibration Procedure D: Magnetometer Calibration

NOTE
Calibration Procedure B must be successfully completed prior to Calibration
Procedure D.
NOTE
Calibration Procedure D must be carried out at a location that is determined to be free of
magnetic disturbances, such as a compass rose. Attempting to carry out this maneuver on
a typical ramp area will not yield a successful calibration. The accuracy of the AHRS
cannot be guaranteed if this calibration is not performed at a magnetically clean location.
A method for evaluating the magnetic disturbances at a candidate site is described in
Section 19.5.
Taxi the aircraft to a site that has been determined to be free of magnetic disturbances. Ensure that there
are no nearby magnetic materials on or near the perimeter of the site. If unavoidable, maneuver the aircraft
to keep the magnetometer from passing within twenty feet (6.1 meters) of such objects. Additionally
ensure that vehicles or other aircraft are an adequate distance [forty feet (12.2 meters)] away from the
aircraft under test.
At the site, align the aircraft to a heading of magnetic north (5°). It is best to offset the aircraft position to
the left (west) of the North/South axis to allow turning clockwise around the site as indicated in
Figure 19-2.
G3X Installation Manual - Post Installation Checkout and Calibration Procedures 190-01115-01
Page 19-18
Figure 19-2 Aircraft Alignment
Rev. L