190-01639-00
GSU 75 ADAHRS Installation Manual
Rev. 6
Page 5-4
5.4 Calibration Procedure A-2: Zero Pitch/Roll Offsets by Manual Entry
NOTE
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 fol-
lowing 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 GSU Page Group is selected.
c) At the GSU Page Group, turn the small FMS to display the GSU/GMU Calibration page.
2. The GSU/GMU Calibration page is protected and requires a keystroke password to perform the
calibration. Press the following softkeys in sequence:
a) softkey 9
b) softkey 10
c) softkey 11
d) softkey 12
3. Press the FMS small knob to highlight GSU 75 #1. The FMS small knob can now be turned to
select either GSU 75 #1 or GSU 75 #2 for calibration. Press the ENTER key after selecting which
GSU 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.
10. Enter a pitch offset value of exactly 0.00 using the FMS small and large knobs as described above.
Press the ENTER key when finished with the pitch offset. The ROLL OFFSET field is now
blinking.
11. Enter a roll offset value of exactly 0.00 using the FMS small and large knobs as described above.
Press the ENTER key when finished with the roll offset.
12. When the RECORD OFFSETS field is blinking, press the ENTER key to complete data entry.
13. The result of the pitch/roll offset compensation is displayed on the PFD. If successful, the AHRS
records the required pitch and roll offsets, informs the operator of a successful conclusion and then
returns to normal operation.
14. Press the ENTER key on the PFD to conclude this procedure.
340095
The document reference is online, please check the correspondence between the online documentation and the printed version.
