Section 923
GARMIN GTX 328 Transponder
Page Date: 5. December 2008
923 - 5
Pilot´s Operating Handbook
EXTRA 300L
Avoid selecting codes 0000, 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!
923.1.3
KEYS FOR OTHER GTX 328 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
Sets the transponder code to the pre-programmed VFR code selected in Configuration Mode (this
is set to 7000 at the factory). Pressing the
VFR
Key again restores the previous identification code.
FUNC
Changes the page shown on the right side of the display. Display data includes Pressure Altitude,
Flight Time, Count Up and Count Down timers. Also displays Contrast and Display (if manual
control and backlighting is selected in the installation configuration).
START/STOP
Starts and stops the 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 (if manual
control is selected in the installation configuration) and enters the number eight into the Count Down
timer.
9
Increases Contrast and Display Brightness when the respective fields are displayed (if manual
control is selected in the installation configuration) and enters the number nine into the Count Down
timer.
923.1.4
FUNCTION DISPLAY
'PRESSURE ALT'
Displays the altitude data supplied to the GTX 328 in feet, hundreds of feet (i.e., flight level), or
meters, (dependent upon installation configuration).
'FLIGHT TIME'
Timer start is configured as either Manual or Automatic. When Manual, displays the Flight Time,
controlled by the
START/STOP
and
CLR
keys. When Automatic, the timer begins when take off
is sensed.
Summary of Contents for 300L
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