190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 32-3
32.1.4 Transponder
All GTX™ 35R/45R/335/345 transponders, and GTX 23ES/33/33ES/330/330ES transponders with
software version 8.00 or later are compliant with RTCA/DO-181D, which specifies the selection of
transponder ALT and GND modes may not be controlled by the pilot. To allow the transponder to be
operated in ALT mode while on the ground, for the purposes of performing periodic testing in accordance
with the requirements of 14 CFR Part 91.413, a special transponder ground maintenance test mode is
provided.
To access ground maintenance mode in a G3X Touch™ avionics system with GDU 4XX displays:
1. Access the Transponder page, press the Menu key.
2. Select Enable Maintenance Test to force the transponder into ALT mode.
To access ground maintenance mode in a G3X system with GDU 37X displays:
1. Access the Transponder Setup page using the Main Menu.
2. Change the setting for Ground Maintenance Test to Enabled to force the transponder into ALT
mode.
Transponder ground maintenance mode will be cancelled following a power cycle, or if the aircraft is
determined to be airborne.
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