Section 915
GARMIN GTX 330 Transponder
Page Date: 19. February 2014
915 - 5
Pilot´s Operating Handbook US
EXTRA 330LX
Avoid selecting code 7500 and all codes in the 7600-7777 range. These trigger special indicators
in automated facilities. Only the code 7500 will be decoded as the hijack code. An aircraft’s
transponder code (if available) is utilized to enhance the tracking capabilities of the ATC facility,
therefore care should be taken when making routine code changes.
915.1.3
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 while the IDENT mode is active.
VFR
Pressing the VFR key sets the transponder code to the pre-programmed VFR code selected in
the Configuration Mode. Pressing the VFR key again will restore the previous identification code.
FUNC
Pressing the FUNC key changes the page shown on the right side of the display. Displayed data
includes Pressure Altitude, Flight Time, Count Up timer, Count Down timers. In the Configuration
Mode, steps through function pages.
START/STOP
Starts and stops the Count Up, Count Down and flight timers. In the Configuration Mode, steps
through functions in reverse.
CRSR
Initiates starting time entry for the Count Down timer and cancels transponder code entry. Returns
cursor to last code digit within five seconds after entry. Selects changeable fields in Configuration
Mode.
CLR
Resets the Count Up and Count Down timers. Cancels the previous keypress during code
selection and Count Down entry. Returns cursor to last code digit within five seconds after entry.
Used in Configuration Mode.
8
Reduces Contrast and Display Brightness when the respective pages are displayed and enters
the number eight into the Count Down timer. Used in Configuration Mode.
9
Increases Contrast and Display Brightness when the respective pages are displayed. Also enters
the number nine into the Count Down timer. Used in Configuration Mode.
915.1.4
FUNCTION DISPLAY
'PRESSURE ALT'
Displays the altitude data supplied to GTX 330 in feet, hundreds of feet (i.e., flight level), or
meters, depending on configuration. An arrow to the right of the altitude indicates that the airplane
is climbing or descending.
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