Gtx 3X5 Controls; Panel Mount Transponder Controls; Mode Selection Keys - Garmin GTX 335 Series Pilot's Manual

2 GTX 3X5 CONTROLS

2.1 Panel Mount Transponder Controls

The GTX 3X5 series transponders have an auto-dimming display and keypad layout. The
keys access the transponder's controls and features.

2.2 Mode Selection Keys

NOTE
The transponder system no longer supports a pilot selectable GND mode. The
transponder should always be in ALT mode prior to moving on the airport surface.
It must be in ALT mode when operating in certain controlled airspace, in
accordance with 14 CFR 91.215. For guidance on transponder operation, refer to
the FAA Aeronautical Information Manual (AIM), 4-1-20(a)(3).
When on the ground or in the air always operate the transponder in ALT mode, unless
otherwise requested by ATC. It is acceptable to go directly from OFF to ALT mode. It is not
necessary to place in SBY mode for a "warm up" period. The transponder automatically
determines whether the aircraft is in the air or on the ground and sends that information
to other aircraft and ATC.
190-01499-00 Rev. C
ON Powers on, disables altitude reporting.
ALT Powers on, enables altitude reporting.
VFR Changes to the preprogrammed squawk code for VFR.
OFF Powers off.
SBY Powers on or changes into standby mode.
IDNT Activates the Ident function.
GTX 335/345 Pilot's Guide
GTX 3X5 XPDR
1 – GTX 3X5 SERIES XPDR
2-1