190-00734-17
GTX 335 w/GPS Installation Guidance
Rev. 1
Page 7-2
7.1 Ground Checks - Interfaces (Configuration Mode)
The performance and checkout procedures contained in this section must be completed for each installed
transponder.
Certain test procedures require the use of a Mode S transponder ramp tester such as an Aeroflex IFR-6000 or
TIC TR-220. Specific instructions for operating the ramp tester are contained in the applicable operator's
manual.
7.1.1 Airborne/Ground Test mode
Certain test procedures require the transponder to be placed in an airborne state to reply to any Mode A or
Mode C interrogations. The GTX uses advanced Air/Ground logic to determine the state of the transponder.
This logic must be temporarily bypassed in order to place the transponder in an airborne state. To place the
transponder into an airborne state, perform the following procedure.
Using the Wizard Tool to place the transponder in Ground Test:
Refer to the GTX 335 Wizard Guide (190-01499-40) for Instructions on how to place the transponder in
Ground Test mode.
For panel mounted GTX 335 transponders:
1. Start the GTX in Ground Test mode (hold the
CRSR
key and press the
ON
key).
2. “GROUND TEST MODE” alert message will be displayed on the GTX 335 message screen.
7.1.2 Audio Panel Interface
The audio alert volume checkout can be performed from the Wizard tool or through the GTX 335 display
panel.
Using the Wizard Tool to conduct the audio Test:
Refer to section 4.3 of the Wizard Tool to conduct an audio test.
For panel mount Test:
1. Start the GTX 335 in configuration mode (hold the
OFF
key to power down the unit, then hold the
ENT
key and push the
ON
key).
2. Navigate to the AUD page (push the
FUNC
key to cycle through pages).
3. Choose each selection of the TEST AUDIO item to play the test audio.
4. Make sure the aural messages/tones will be heard under all anticipated cockpit noise conditions.
cockpit noise conditions.
