Ground Check - Transponder; Software Installation Procedure - Garmin GTX 3X5 Series Installation Manual

6.13 Ground Check - Transponder

FAR 91.413 transponder checks require the GTX to reply to different types of interrogations. The GTX 3X5 only replies
to Mode S/A/C All Calls when airborne.
To simulate a temporary airborne state, place the GTX 3X5 in Ground Test mode. Ground Test mode overrides the
air/ground logic to transmit as if the GTX is airborne. This mode has a duration of one power cycle.
To enable Ground Test mode, press and hold CRSR while applying power to the unit. Ground Test mode can be
enabled by the GTX 3X5 Install Tool on the State page.
FAR 91.413 provides guidance for the transponder check.

6.14 Software Installation Procedure

For software installation procedures refer to GTX 3X5 Transponder Installation Tool Guide.
190-01499-02
Rev. 9
Post Installation Configuration & Checkout
GTX 3X5 Transponder TSO Installation Manual
Page 6-34