When the transponder code is changed, a notification is sent to ATC by the GTX 330. This notification is temporary and may not be sent if the GTX is not active (i.e., set to ON, ALT or GND) when the code is changed.
NOTE: On a dual transponder installation, change the code on the active transponder. This ensures the notification is transmitted to ATC.
Keys for Other GTX 330 Functions
IDENT Pressing the IDENT key activates the Special Position Identification (SPI) Pulse for 18 seconds, identifying your transponder return from others on the air traffic controller’s screen. The word IDENT will appear in the upper left corner of the display during this time.
VFR Sets the transponder code to the
FUNC Changes the page shown on the right side of the display. Display data includes Pressure Altitude, Flight Time, Altitude Monitor, Count Up, and Count Down timers. Also displays Outside Air Temperature, Density Altitude, Contrast, Display, and
START/STOP Starts and stops the Altitude Monitor, Count Up, Count Down, and Flight timers.
CRSR Initiates starting time entry for the Count Down timer and cancels transponder code entry.
CLR Resets the Count Up, Count Down, and Flight timers. Cancels the previous keypress during code selection and Count Down entry. Returns cursor to the fourth code digit within five seconds after entry.
8 Reduces Contrast and Display Brightness when the respective fields are displayed (dependent upon installation configuration) and enters the number eight into the Count Down timer.
9 Increases Contrast and Display Brightness when the respective fields are displayed (dependent upon installation configuration) and enters the number nine into the Count Down timer.
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