190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 6-5
6.3.1.1 GDU 4XX PFD Configuration Module
The GDU 4XX PFD 1 display uses a configuration module designated as the master system configuration
module. The master system configuration module stores configuration data identical to the PFD
configuration data stored in the PFD memory. The PFD cross-checks the configuration module data
against internal PFD memory and self-configures to match the master system configuration module. The
PFD also maintains control of other LRUs’ configuration and calibration settings. This allows critical data
to be retained with the airframe even if the PFD 1 display is replaced.
6.3.2 Additional Equipment Required
A 3/32” hex drive tool is required to secure the GDU 4XX to the panel as described in Section 6.6.1
Unit
Installation and shown in Figure 6-5
(GDU45X), Figure 6-8 (GDU 46X), and Figure 6-11 (GDU470).
6.4 Unit Installation
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
recommended for installation of the GDU 4XX. Refer to Section 2.3
for wiring considerations, and to
Section 23.3
for pinouts.
Connector kits include backshell assemblies. Garmin’s backshell connectors give the installer the ability to
quickly and easily terminate shield grounds at the backshell housing. The instructions needed to assemble
the backshell connector w/Shield Block grounding system are located in Section 22
.
Replacement cursor knobs (part number K00-00578-00) for the GDU 4XX are available from a Garmin
dealer.
6.5 Antennas
Refer to Section 20 for antenna information.
NOTE
GDU 4XX units cannot be used with GA 35, GA 36, or GA 37 antennas.
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