
Page 7-30 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
7.7.2.3 Procedure B: GRS 77/GMU 44 Magnetometer Calibration
Procedure A-1 must first be successfully accomplished before performing Procedure B,
only for situations where the GRS 77 was replaced with a new unit.
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. If the compass rose condition is not known, it is
recommended that the technician follow the guidance in Section 7.7.2.3.
1. Start the aircraft engine following the procedures referenced in the G1000/DA40 AFMS.
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°).
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.
4. Restart the PFD and MFD in configuration mode.
5. Go to the GRS Page Group on the PFD (note that engine instruments may be monitored at this
page).
Figure 7-14. GRS/GMU Calibration Page
6. Select the GRS/GMU Calibration page and enter the following softkey password:
a) 9
b) 10
c) 11
d) 12 (Far Right softkey)
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