G1000 Nav III Line Maintenance Manual
Page 4-23
190-00352-00
Rev.
L
4.4.5.2
Procedure B: Magnetometer Calibration
Figure 4-7. Magnetometer Calibration
Calibration Procedure B must be carried out on a calibrated compass rose (see G1000 Line Maintenance and
Configuration Manual for a procedure to verify magnetic cleanliness of the compass rose) in order to guarantee
measurements free of environmental magnetic disturbances. 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 on a magnetically clean compass rose.
Taxi the aircraft to a compass rose. Ensure that there are no nearby magnetic materials on or near the perimeter of
the compass rose. 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 adequate distance away from
the aircraft under test.
At the compass rose, align the aircraft with a heading of magnetic north (
±
5°) with sufficient offset to the left
(west) of the North/South axis to allow a clockwise turn around the compass rose to be performed. See figure
below:
With the aircraft stationary, initiate the GRS 77 AHRS magnetometer calibration procedure as
follows:
1.
If the MFD and PFD(s) are not in configuration mode, proceed with step 2. If the MFD and PFD(s) are
already in configuration mode, skip ahead to Step 3.
N
S
E
W
Summary of Contents for G1000 NAV III
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