Squawk Code Keys; Figure 2-1 Squawk Code Entry Field; Table 2-1 Mode Section Key Functions; Table 2-2 Squawk Code Key Functions - Garmin GTX 3X5 Series Pilot's Manual

2 – GTX 3X5 CONTROLS
The SBY key selects the standby mode. The transponder will not reply to any interrogations
SBY
or transmit ADS-B Out.
If BT functions are enabled, BT functionality remains operational.
The GTX 345 will continue to receive ADS-B In information, but there will be limited TIS-B
coverage.
ON The ON key selects the on mode. The transponder replies to interrogations. It does not
include pressure altitude.
The Reply (
The ALT key selects the alt mode. Alt mode should always be used while in the air and on
ALT
the ground, unless otherwise requested by ATC. All aircraft air/ground state transmissions
are handled via the GTX 3X5 transponder and require no pilot action. The transponder
replies to identification and altitude interrogations.
The Reply (
GTX 3X5 transmissions include pressure altitude.
2.3

Squawk Code Keys

There are eight squawk code entry keys (0 – 7). They provide access to all ATCRBS
codes. Pressing one of the squawk code entry keys begins the code selection sequence.
Digits that are not yet entered appear as underscored blanks. When the fourth digit is
entered the new code is activated.
To move the cursor back to the previous digit, press the CLR key.
To move the cursor back to the first digit, press and hold the CLR key.
Pressing the CLR key when the cursor is on the first digit removes the cursor and cancels the code entry,
retaining the last code entered.
Pressing the CRSR key when entering the code removes the cursor and cancels the code entry. The last
code entered is retained.
2-2

Table 2-1 Mode Section Key Functions

) symbol on the display indicates the transponder is actively responding.
) symbol on the display indicates the transponder is actively responding. The

Table 2-2 Squawk Code Key Functions

Figure 2-1 Squawk Code Entry Field

Garmin GTX 335/345 Pilot's Guide 190-01499-00 Rev. A