____________________________________________________________________
G1000 System Maintenance Manual
Page 7-15
190-00903-00
Rev.
A
6.
Press the FMS inner knob to highlight GRS 77 #1. The FMS inner knob can now be
turned to select either GRS 77 #1 or GRS 77 #2 for calibration. Press the ENT key after
selecting the desired GRS 77 unit to calibrate. The SELECT PROCEDURE field is now
blinking.
7.
Using the FMS inner knob, select MAGNETOMETER and press the ENT key. If the
MAGNETOMETER selection continues to blinking, press the ENT key again.
8.
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.
9.
The PFD advises the operator when to turn the aircraft, when to stop, and when to turn
again.
10.
Upon instruction to turn, taxi the aircraft in a right turn. After approximately 30° of turn
from the last heading the PFD instructs 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.
11.
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 if stations are
skipped, at least a minimum of 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.”
12.
Repeat the turn-and-stop process until the PFD instructs the operator that a successful
calibration is complete.
13.
Press the ENT key on the PFD.
14.
Repeat steps 1 through 13 for GRS 77 #2.
