Page 3-32 G1000 V8.XX S/W Load and Post Install Checkout – Columbia 350/400
Revision 1 190-00577-04
The G1000-equipped Columbia 350/400 used to evaluate the site must have already completed the
pitch/roll offset compensation procedure (Procedure A). However, prior completion of the Magnetometer
Calibration Procedure (Procedure B) is not required.
In order to evaluate a candidate site, the Magnetometer Calibration Procedure must be performed twice:
once turning clockwise around the site, and once turning counter-clockwise. Both times, the procedure
should be conducted as described in Section 3.12.2 of this document, with the exception of the direction
of turns around the site.
NOTE
Although Section 3.12.2 indicates that the Magnetometer Calibration
Procedure should be performed by making a series of clockwise turns
around the site, the procedure can also be performed by making counter-
clockwise turns for the purpose of evaluating the site for magnetic
disturbances.
If, upon completion of the Magnetometer Calibration Procedure in each clockwise and counter-clockwise
direction, the PFD displays the “CALIBRATION SUCCESSFUL / SITE IS CLEAN” message, then the
candidate site is sufficiently free of magnetic disturbances and is acceptable for performing the
Magnetometer Calibration Procedure. It is important to obtain successful results in both the clockwise
and counter-clockwise directions to ensure that the magnetometer sweeps over a large enough area at the
candidate site.
If, upon completion of the Magnetometer Calibration Procedure in either of the two directions, the PFD
displays either the “MAG FIELD AT SITE NOT UNIFORM”, or “MAG FIELD AT SITE DIFFERS
FROM IGRF MODEL” message, then the site contains magnetic disturbances that are too large.
3.12.2 GRS 77/GMU 44 Magnetic Calibration
CAUTION
CALIBRATION PROCEDURE B MUST BE CARRIED OUT ON A COMPASS ROSE IN ORDER TO
GUARANTEE MEASUREMENTS FREE OF ENVIRONMENTAL MAGNETIC DISTURBANCES.
ATTEMPTING TO CARRY OUT THIS MANEUVER ON A TYPICAL RAMP AREA MAY 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 OR EQUIVALENT. IF THE COMPASS ROSE CONDITION IS NOT KNOWN, IT
IS RECOMMENDED THAT THE TECHNICIAN FOLLOW THE GUIDANCE IN SECTION 3.12.1
1. Follow instructions in Section 3.11 and check the GEA 71. Start the aircraft engine following the
procedures referenced in the G1000/Columbia 350/400 Airplane Flight Manual Supplement.
2. After aircraft engine startup, taxi the aircraft to a properly calibrated compass rose.
3. At the compass rose, align the aircraft to a heading of magnetic north (±5°).
4. Restart the PFD and MFD in configuration mode.
NOTE
The engine performance can be monitored on the GRS/GMU calibration pages
during the procedure.
5. Go to the GRS Page Group on the PFD.
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