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Page 7-16 LMM for the Kodiak 100
190-02102-00 Rev.4
13. When the RECORD OFFSETS field is flashing, press the ENTER key to
complete data entry.
14. The result of the pitch/roll offset compensation is displayed on the PFD. If
successful, the AHRS records the required pitch and roll offsets, informs the
operator of a successful conclusion and then returns to normal operation.
15. Press the ENTER key on the PFD to conclude this procedure.
7.6.3 Calibration Procedure B: Magnetometer Calibration
With a dual GRS installation, it is preferable to calibrate the #1 & #2 GMUs
at the same time by selecting GRS #1 on the PFD & GRS #2 on the MFD.
Calibrating both GMUs at the same time and at the same location reduces
the possibility of having HDG splits between the #1 & #2 systems.
Calibration Procedure A-1 or A-2 must be successfully completed before
Calibration Procedure B. If either Calibration Procedure A-1 or A-2 is
repeated, then Procedure B must also be repeated.
Calibration Procedure B 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 calibra-
tion is not performed at a magnetically clean location. A method for evalu-
ating the magnetic disturbances at a candidate site is described in Section
7.6.7.
Taxi the aircraft to a site that has been determined to be free of magnetic disturbances.
Ensure 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 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°). The aircraft should be
positioned to enable clockwise turning around the compass rose. For fixed-wing aircraft,
it is best to offset the aircraft position to the left (west) of the North/South axis (see Figure
7-5).
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