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G3X/G3X Touch Install Manual - GDU 4XX Config and Post Install Checkout
Rev. AC
Page 34-1
34 GDU 4XX CONFIGURATION AND POST INSTALLATION
CHECKOUT
The checkout procedures in this section are recommended to be performed after installing the G3X. The
calibration procedures are required to be performed after installing the G3X. It is assumed that the person
performing these checks is familiar with the aircraft, has a working knowledge of typical avionics systems,
and has experience using the test equipment defined in this section.
If replacing GDU 37X display(s) with GDU 4XX display(s), the following may be helpful in transferring
some of the stored calibration data.
•
As the data stored in the
cannot be transferred from the GDU 37X displays
to GDU 4XX displays, Garmin suggests recording GDU 37X stored calibration data such as
V-speeds, RS-232 settings, ARINC 429 settings, engine gauge configuration, etc. to be used in the
GDU 4XX. This is done by writing down the info or by storing screenshots.
•
If reusing the GDU 37X configuration module, it should be erased (after recording stored info per
above) by selecting it on the main config page, pressing the Menu key, and selecting the option to
format the configuration module. Then re-enter the various settings (with changes as required to
accommodate any updated wiring) per
.
•
The fuel level calibration can be backed up/restored by accessing the appropriate calibration page,
pressing the Menu key, and selecting the option to read/write the calibration to/from the SD card
(repeat for each tank) per
Fuel Quantity Calibration Data Backup
•
If the ADAHRS LRUs (GMU 44/GSU 25/ GSU 73) are not being replaced or moved, the AHRS
calibration will remained stored/valid, and does not need to be recalibrated.
NOTE
The procedures and screenshots in this section apply to the GDU 45X, GDU 46X, and
GDU 470 units. Differences in appearance and layout of the screenshots may exist
between the two models and may differ slightly from the actual displayed image on the
GDU 4XX.
NOTE
Some procedures in this section require that the GPS receiver is receiving sufficient
satellite signal to compute a present position (
). This requires outdoor line-of-
site to GPS satellite signals or a GPS indoor repeater.
NOTE
As these procedures involve engine run-up and moving the aircraft, it is recommended that
the installer read this entire section before beginning the checkout procedure.
NOTE
Ensure that all GDU 4XX displays have been updated to the current software version
before performing any post-installation configuration, checkout, or calibration steps, and
before attempting to troubleshoot any issues. Using up-to-date software ensures that all
previous software improvements are available, and is the most effective first step after
powering on the system. See
for information about updating GDU 4XX
software.
