Page 5-4
G1000/GFC 700 Post Installation Checkout Procedure - Hawker / Beechcraft King Air C90
Revision 5
190-00682-00
5.3.2
Procedure B: GRS 77/GMU 44 Magnetic Calibration
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 5.3.1.
1. Follow instructions in Section 5.2, and check the engine instruments. Operate engines in
accordance with Hawker Beechcraft C90B engine starting and operating procedures.
Monitor engine instruments during startup for proper operation. When engines and systems
are operating satisfactorily, the technician may begin final AHRS calibrations.
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°).
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 PFD1 in configuration mode.
5. Go to the GRS Page Group on PFD1.
CAUTION
