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GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 1-8 Rev. 4
1.5 GTN/GMA 35 Installation Overview
Always follow acceptable avionics installation practices per AC 43.13-1B, AC 43.13-2B, or later FAA
approved revisions of these documents. The GPS/SBAS installation instructions have been prepared to
meet the guidance material contained in AC 20-138A, Airworthiness Approval of Global Navigation
Satellite System (GNSS) Equipment”. The communications installation instructions have been prepared
to meet the guidance material defined by AC 20-67B, “Airborne VHF Communications Equipment
Installations”. Follow the installation procedure in this section, as it is presented, to accomplish a
successful installation. Read the entire section before beginning the work.
Prior to installation, consider the structural integrity of the GTN/GMA 35 installation as defined in
Section 3.4. Complete an electrical load analysis in accordance with the instructions in Section 3.6.8 on
the aircraft prior to starting the modification to ensure the aircraft has the ability to carry the additional
GTN and optional GMA 35 electrical load. Once the installation is complete, perform the post installation
checkout described in Chapter 5 before closing the work area in case problems occur.
1.5.1 GTN/GTX Installation Overview
This section contains considerations for connecting GTN units with the GTX 32/33/327/328/330
transponders. The GTN utilizes RS-232 to communicate with the GTX transponders. If GTN control of
the transponder is desired, see Section 1.5.1.1 for more information. If GTN control of the GTX 327 or
330 is not desired, see Section 1.5.1.2 for more information.
Pressure altitude is transmitted from the GTN to the GTX over the RS-232 connections discussed below.
Pressure altitude is not transmitted from the GTX to the GTN over these RS-232 connections (except for
some GTX 327 installations, see Section 1.5.1.1 for more information). For this reason, it is
recommended that the aircraft’s pressure altitude source be connected directly to the GTN.
If there is only one GTN and one GTX, they communicate over a direct RS-232 connection as shown in
Figure 1-3.
GTN
6XX/
7XX GTX 3X/3XX
RS232
Figure 1-3. Interface between One GTN and One GTX
30


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