190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AC
Page 33-33
33.4.4.3 Magnetometer Calibration
NOTE
The ADAHRS Unit Orientation (
), the Pitch/Roll Offset Compensation
), and the GMU 11 Unit Orientation (
, if applicable) must
be successfully completed prior to performing the Magnetometer Calibration.
NOTE
The Magnetometer Calibration 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 ADAHRS cannot be guaranteed if this calibration is not performed at a magnetically
clean location.
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 33-3.
Figure 33-3 Aircraft Alignment
