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3.8.4
Installation with Other ADS-B Out Systems
If the GTX 335 transponder is being installed in an aircraft with other ADS-B Out capable equipment, the
other ADS-B Out equipment should be Version 2 compliant (TSO-C166b/RTCA DO-260B or
TSO-C154c/DO-282B). The UAT or 1090 ES transmit functionality of a Version 1 compliant system should
be disabled if it is not upgraded to be Version 2 compliant. Refer to table 3-7 to identify actions that should
be taken to make sure only Version 2 compliant ADS-B and UAT systems can transmit.
Table 3-7 Version 2 Compliance w/ Multiple ADS-B Out Equipment Installation
GTX 335
with ADS-B Out
(TSO-C166b /
DO-260B)
(ADS-B Version 2
Compliant)
3.9 Placards/Labels
New circuit breakers, switches, and annunciators installed for the GTX 335 unit must be labeled. Refer to
the applicable interconnect drawings in appendix B. In order to prepare and install placards or labels:
•
Put the placard or label in a location adjacent to the switch, annunciator, circuit breaker, etc.
•
Make sure the placard or label is readable in all cockpit lighting conditions.
◦
Ambient flood lighting is satisfactory.
•
Make sure the placard or label is not easily erased, damaged, or obscured.
•
Text color should be black or white.
◦
Do not use amber, red, or green.
•
Font size should be 10 or 12 pt (minimum 0.10 in.).
•
Font weight should be normal or bold with a solid color.
•
Font style should be regular, non-italic, and easy to read.
3.10 Switches
The GTX 335 can be connected to external switches for the usual functions. Momentary switches for
TRAFFIC MUTE and IDENT are optional and should be connected as shown in the interconnection
diagrams. As required, toggle switches for other functions can be attached to discrete inputs to set system
parameters. Refer to section 8 for GTX 335 available discrete outputs and inputs.
190-00734-17
Rev. 1
If the other ADS-B Out System is:
TSO-C154c / DO-282B UAT
equipment (UAT Version 2 Compliant)
TSO-C154b / DO-282A UAT
equipment (UAT Version 1 Compliant)
TSO-C166a / DO-260A 1090ES
equipment (ADS-B Version 1 Compliant)
TSO-C166b / DO-260B 1090ES
equipment (ADS-B Version 2 Compliant)
Action
None.
Both systems are Version 2 compliant.
Option 1: Upgrade UAT equipment to
be Version 2 compliant. Contact
equipment manufacturer for possible
upgrade selections.
Option 2: Disable transmit functionality
of Version 1 compliant equipment. Refer
to equipment manufacturer's
installation manual for instructions.
Two ADS-B Out systems on the same
link should not be operated at the same
time. Disable transmit functionality of
other ADS-B equipment. Refer to
equipment manufacturer's installation
manual for instructions.
GTX 335 w/GPS Installation Guidance
Page 3-7
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