Garmin GTX 330 System Maintenance Manual page 17

Avoid selecting code 7500 and all codes in the 7600-7777 range. These codes trigger special indicators in
automated facilities. An aircraft's transponder code is used for ATC tracking purposes, therefore exercise
care when making routine code changes.
Function Display
PRESSURE ALT Displays the altitude data supplied to the GTX 330 in feet, hundreds of feet (i.e.,
FLIGHT TIME Displays the Flight Time, controlled by the START/STOP key or by one of four
ALTITUDE
MONITOR
OAT/DALT Displayed when the GTX 330 is configured with temperature input.
COUNT UP
TIMER
COUNT DOWN
TIMER
CONTRAST This page is only displayed if manual contrast mode is selected in Configuration
DISPLAY This page is only displayed if manual backlighting mode is selected in
ADS-B TX Controlled by START/STOP key. Starts/stops extended squitter function.
FLIGHT ID If system is configured for FLT ID PWR-UP ENTRY at installation, the FLIGHT
3.2 GTX 33/33D
Figure 6 shows a screenshot of the GTX control page associated with the GTN 7XX series touchscreen
navigator. Refer to the following Garmin documents for details regarding the controls and their functions.
Table 2. GTN 7XX Series Transponder Control Reference Documents
GTN 725/750 Cockpit Reference Guide (CRG)
GTN 725/750 Pilot's Guide
Figure 7 shows a screenshot of the GTX control page associated with the GTN 6XX series touchscreen
navigator. Refer to the following Garmin documents for details regarding the controls and their functions.
Table 3. GTN 6XX Series Transponder Control Reference Documents
GTN 625/635/650 Cockpit Reference Guide (CRG)
GTN 625/635/650 Pilot's Guide
190-00734-11
Rev. 1
The document reference is online, please check the correspondence between the online documentation and the printed version.
flight level), or meters, depending on configuration.
airborne sources (squat switch, GPS ground speed recognition, Airdata airspeed
recognition or altitude increase) as configured during installation. The timer begins
when the GTX 330 determines that the aircraft is airborne.
Controlled by START/STOP key. Activates a voice alarm and warning annunciator
when altitude limit is exceeded
Outside Air Temperature and Density Altitude.
Controlled by START/STOP and CLR keys.
Controlled by START/STOP, CLR, and CRSR keys. The initial Count Down time
is entered with the 0 – 9 keys.
mode. Contrast is controlled by the 8 and 9 keys.
Configuration mode. Backlighting is controlled by the 8 and 9 keys.
ID entry page will be present on power up of GTX 330. This allows the pilot/crew to
enter the specific Flight ID for transmission to ATC interrogations.
Document Title
Document Title
Document Number
Document Number
GTX 330/33 with ADS-B Out
Maintenance Manual with ICA
3-3
Displays
190-01007-04
190-01007-03
190-01004-04
190-01004-03