190-00734-11
GTX 33X and GTX 3X5 ADS-B Maintenance Manual
Rev. 6
Page 2-6
2.3 GTX 335/335R
The GTX 335/335R units are panel or remote mounted units providing Mode S with ADS-B Out extended
squitter capability. The panel mounted unit contains an integrated display while the remote mounted unit
requires an interface to a control source for normal operation and functionality.
GTX 335/335R units provide the following features.
Mode S transponder
ADS-B Out capability
Optional internal GNSS receiver
Optional altitude encoder module
Entry and display of squawk code and flight ID
Display of pressure altitude
Display of outside air temp
Display of density altitude
Display of flight timers
Audio output
TIS-A traffic output to a compatible display
The transponder annunciates when the unit has an ADS-B Out failure to alert the crew that the unit has a
degraded ADS-B system.
GTX 335/335R units communicate through the following interfaces.
ARINC 429
RS-232
Gray code
Discrete I/O
Figure 2-3 provides a summary of the interfaces provided for the GTX 335 or GTX 335R. Refer to
GTX 3XX Part 23 AML STC Installation Manual
for interfaces allowed under this STC.
