G1000/GFC 700 Post Installation Checkout Procedure – Hawker / Beechcraft King Air C90
Page 5-5
190-00682-00
Revision 5
6. Select
the
GRS/GMU
Calibration page and enter the following softkey password:
a) 9
b) 10
c) 11
d) 12 (Far Right softkey)
7. Ensure that GRS1 is selected.
8. Activate the cursor and highlight the
SELECT PROCEDURE
window and select
MAGNETOMETER
.
9. Press
the
ENT
button.
10. Use the cursor to highlight the
BEFORE CALIBRATION
window.
11. 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.
12. The PFD1 display advises the operator when to turn the aircraft, when to stop, and when to
turn again.
13. 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.
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.
14. The PFD guides the operator to dwell at multiple headings around a complete circle.
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.”
15. Repeat the turn-and-stop process until the PFD advises that a successful calibration is
complete. The GRS AHRS then enters its normal operational mode. Press the ENT button
on PFD1 to conclude this procedure.
16. Repeat Steps 8 – 15 for the GRS2.
17. Proceed to Section 5.3.3 for the engine run-up procedure.
NOTE
NOTE
