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5.4
Calibration Procedure A-2: Zero Pitch/Roll Offsets by Manual Entry
Procedure A-2 requires a unique pass-code that is not listed here.
Contact Garmin for the pass-code.
1. Initiate the AHRS Ground Pitch/Roll Aircraft Level compensation mode by performing the
following steps:
a)
Enter the configuration mode by holding the ENTER key on both displays while applying
power. Release the ENTER key when the words INITIALIZING SYSTEM are displayed on
the PFD and MFD.
b)
On the PFD, turn the FMS large knob clockwise until the GRS Page Group is selected.
c)
At the GRS Page Group, turn the small FMS to display the GRS/GMU Calibration page.
2. The GRS/GMU Calibration page is protected and requires a keystroke password to perform the
calibration. Press the following softkeys in sequence:
i.
ii.
iii.
iv.
3. Press the FMS small knob to highlight GRS 77 #1. The FMS small knob can now be turned to
select either GRS 77 #1 or GRS 77 #2 for calibration. Press the ENTER key after selecting
which GRS 77 unit to calibrate. The Select Procedure field is now blinking.
4. The FMS small knob can now be used to select which calibration/validation procedure to run.
Select PITCH/ROLL OFFSET, then press the ENTER key. If the PITCH/ROLL OFFSET
selection is still blinking, press the ENTER key again.
5. Contact Garmin for password.
6. Follow the checklist items displayed on the PFD and press the ENTER key as each one is
completed or confirmed.
7. When the PASSCODE field is blinking, enter the appropriate pass-code by using the FMS small
knob to change the value of the first digit and the FMS large knob to move to the next digit of the
pass-code. Press the ENTER key when finished entering the pass-code.
8. When the CALIBRATE field is blinking, press the ENTER key to begin the procedure.
9. After several seconds, additional instructions appear in the lower half of the PFD and the PITCH
OFFSET FIELD will be blinking.
GRS 77/GMU 44 Installation Manual
190-00303-10
softkey 9
softkey 10
softkey 11
softkey 12
NOTE
Page 5-5
Revision L
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