Page 15-42
G900X/G950 Installation and Maintenance Manual – Software, Configuration, and Calibration
Revision D
190-00719-00
6.
Select the GRS/GMU Calibration page and enter the following softkey password:
a)
9
b)
10
c)
11
d)
12 (Far Right softkey)
Note that engine instruments may be monitored at this page.
7.
Activate the cursor and highlight the SELECT PROCEDURE window and select
MAGNETOMETER.
8.
Press the ENT key.
9.
Use the cursor to highlight the BEFORE CALIBRATION window.
10.
Follow the checklist items displayed on the PFD and press the ENT key as each one is
completed or confirmed. When the CALIBRATE field is blinking, press the ENT key to
begin the procedure.
11.
The PFD display advises the operator when to turn the aircraft, when to stop, and when to
turn again.
12.
Upon instruction to turn, taxi the aircraft in a right turn. After approximately 25° to 30° of
turn from the last heading, the PFD display advises the operator to stop the aircraft.
NOTE
Due to the difficulties in executing smooth, accurate turns the PFD may incorrectly
interpret a station and instruct to “HOLD POSITION” prior to full completion of a 30
°
turn. If this scenario is encountered, it is best for the operator to ignore the “HOLD
POSITION” command and instead use outside references to complete the approximate
30
°
turn. Instead of using the PFD instruction to turn as a real-time indication of when to
turn, simply judge the 30° (±5°) turn increments of the aircraft by using the compass rose
radials. Dwelling at these 30
°
increments for the time recommended by the PFD should
result in successful calibration.
13.
The PFD guides the operator to dwell at multiple headings around a complete circle.
NOTE
Due to high winds or excessive airframe vibration, the operator may 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
°
). A minimum of 2
successful stations per quadrant is required, where a successful station is a full 18-second
countdown followed by instruction to move. Ensure that at least 2 stations per quadrant
are completed. Thus, it may sometimes be required to dwell at a station after a
countdown 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.”
