Software Update - Garmin GTX 335 w GPS Installation Guidance

5 SOFTWARE UPDATE

5.1 Software Check.................................................................................................................................5-2
5.1.1 GTX 335 Software Version Check ............................................................................................5-2
CAUTION
If the unit is removed from the aircraft and operated, connect the transponder antenna
connection to a 50 ohm 5 watt load. The GTX transmits Mode S acquisition squitter pulses
once per second whether interrogations are received or not. Failure to connect a dummy
load or antenna during this procedure will cause the transponder to fail and possibly
damage the unit.
CAUTION
Do not turn off the unit until "Update Complete" is shown next to all selected items.
Failure to do so could result in equipment damage.
NOTE
The modifications in this section are mandatory to meet the requirements of AC 20-165A
and this STC. These modifications are applicable for ALL installations associated with this
STC.
NOTE
Screen shots in this section are provided for reference only. For current approved GTX
software versions, refer to GTX 33X and GTX 3X5 ADS-B AML STC Equipment List.
190-00734-17
Rev. 1
GTX 335 w/GPS Installation Guidance
Page 5-1