190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-1
30 GDU™ 4XX DISPLAY CONFIGURATION AND POST
INSTALLATION CHECKOUT
The checkout procedures in this section are recommended to be performed after installing the G3X™
avionics. The calibration procedures are required to be performed after installing the G3X. It is assumed
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 configuration module
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 Section 30.4
.
• 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 the GPS receiver is receiving sufficient satellite
signal to compute a present position (Table 30-2
). 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 the
installer read this entire section before beginning the checkout procedure.
NOTE
Make sure 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 makes sure that
all previous software improvements are available, and is the most effective first step after
powering on the system. See Section 30.3.1
for information about updating GDU 4XX
software.
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