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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 pre-programmed VFR code
selected during installation configuration (this is set to 1200 at the
factory). Pressing the VFR key again restores the previous identification
code. If the VFR Key is pressed when disabled (dependent upon
installation configuration) a VFR Key Disabled message appears to
indicate that no operation took place.
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 ADS-B Operation
(dependent upon installation configuration).
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.
After the transponder has become part of the Air Traffic Control Radar Beacon System
(ATCRBS) any changes to the squawk code should be made on the active transponder. Thus
ensuring ATC radar interrogations are properly correlated with the associated call sign for voice
communication with the aircraft.
NOTE: On a dual transponder installations, change the squawk code on the
active transponder.
NOTE: When instructed to do so, always change the transponder code on
the active GTX330(D). On dual transponder installations, it is not advisable
When changing the squawk code in a dual transponder installation, the new squawk code may
be entered on the standby transponder but it must be set to ON or ALT immediately following the
code change. When a squawk code is changed a short notice transmission is sent to ATC. This
notice transmission is sent to ensure that the ATC radar interrogation are properly correlated with
the associated call sign for voice communication with the aircraft. If the standby GTX 330 is not
activated immediately ground based facilities my not recognize the code change.
NOTE: When instructed to do so, always change the squawk code on the active GTX 330(D). On a
dual transponder installations, it is not advisable to change the squawk code by activating the standby
GTX 330(D).