Calibration Procedure C: Heading Offset Compensation - Garmin G1000 Line Maintenance Manual

Uncontrolled if Printed
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NOTE
Due to high winds or excessive airframe vibration, the operator might
encounter a condition where the PFD restarts the 18-second countdown
without full completion of the previous countdown. If this is encountered
more than once for a given station, the operator should begin turning to the
next station (approximately 30 degress). A minimum of 2 successful sta-
tions per quadrant is required, where a successful station is a full 18-sec-
ond countdown followed by instruction to move. Ensure that if stations are
skipped, at least a minimum of 2 stations per quadrant are completed.
Thus, it might sometimes be required to dwell at a station after a count-
down restart. A maximum of 30 stations is allowed for the entire calibration
procedure. If too many countdown restarts are encountered, the calibration
will fail with the message, TOO MANY STATIONS.
9. Repeat the turn-and-stop process until the PFD instructs the operator a
successful calibration is complete.
10. Press the ENTER key on the PFD to conclude this procedure.
NOTE
A magnetometer calibration failure is indicated by a Calibration Error mes-
sage. In the event of a failure, make sure the installation passes the Mag-
netometer Interference Test, check the relative orientation of the GRS 77
relative to the GMU 44, and (if needed) move the aircraft to a different loca-
tion and attempt the magnetic calibration again.

7.6.4 Calibration Procedure C: Heading Offset Compensation

Calibration Procedures A and B must have been successfully completed before
Calibration Procedure C can be performed. For calibration accuracy, maneuver the
aircraft with assistance from outside the cockpit to precisely align the aircraft to cardinal
compass heading reference lines on the compass rose.
NOTE
In order to accomplish the necessary degree of accuracy in heading align-
ment, it is generally required the aircraft be physically towed by hand. Tow-
ing tugs should not be used as they distort the magnetic field in their
vicinity.
1. If the PFD is not displaying the GRS/GMU CALIBRATION configuration page,
follow steps from calibration procedure A-1 listed previously.
2. The FMS small knob can now be used to select which calibration/validation
procedure to run. Select HEADING OFFSET, then press the ENTER key. If the
HEADING OFFSET selection is still flashing, press the ENTER key again.
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Page 7-18 LMM for the Kodiak 100
190-02102-00 Rev.4