Garmin GTX 3X5 Series Pilot's Manual

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Garmin GTX 3X5 Series Pilot's Manual Manual pdf 14 page image

2-2 Garmin GTX 335/345 Pilot’s Guide 190-01499-00 Rev. A2 – GTX 3X5 CONTROLS2.3 Squawk Code KeysThere are eight squawk code entry keys (0 – 7). They provide access to all ATCRBScodes. 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 isentered the new code is activated.Figure 2-1 Squawk Code Entry FieldTable 2-1 Mode Section Key FunctionsSBY The SBY key selects the standby mode. The transponder will not reply to any interrogationsor 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-Bcoverage.ON The ON key selects the on mode. The transponder replies to interrogations. It does notinclude pressure altitude.The Reply ( ) symbol on the display indicates the transponder is actively responding.ALT The ALT key selects the alt mode. Alt mode should always be used while in the air and onthe ground, unless otherwise requested by ATC. All aircraft air/ground state transmissionsare handled via the GTX 3X5 transponder and require no pilot action. The transponderreplies to identification and altitude interrogations.The Reply ( ) symbol on the display indicates the transponder is actively responding. TheGTX 3X5 transmissions include pressure altitude.Table 2-2 Squawk Code Key FunctionsTo 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 lastcode entered is retained.