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GTX 330 Installation Manual Page 5-3
190-00207-02 Revision G
• CRSR Initiates entry of the starting time for the Count Down timer and cancels
transponder code entry. Selects changeable fields in Configuration mode.
• CLR Resets the Count Up, Count Down and Flight timers. Cancels the previous
keypress during code selection and Count Down entry. Used in Configuration
mode.
• 8 Reduces Contrast and Display Brightness when the respective fields 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 fields are displayed
and enters the number nine into the Count Down timer. Used in Configuration
mode.
5.1.2 Code Selection
Code selection is done with eight keys (0 – 7) providing 4,096 active identification codes. Pushing one of
these keys begins the code selection sequence. The new code is not activated until the fourth digit is
entered. Pressing the CLR key moves the cursor back to the previous digit. Pressing the CLR key when
the cursor is on the first digit of the code, or pressing the CRSR key during code entry, removes the
cursor and cancels data entry, restoring the previous code. You may press the CLR key up to five
seconds after code entry is complete to return the cursor to the fourth digit. The numbers 8 and 9 are not
used for code entry, only for entering a Count Down time, contrast and display brightness, and data
selection in the Configuration mode.
NOTE
The selected identification code should be entered carefully, either one
assigned by air traffic control for IFR flight or an applicable VFR
transponder code.
• Important Codes:
1200 VFR code for any altitude in the US (Refer to ICAO standards elsewhere)
2000 VFR code commonly used in Europe (Refer to ICAO standards)
7000 VFR code commonly used in Europe (Refer to ICAO standards)
7500 Hijack code (Aircraft is subject to unlawful interference)
7600 Loss of communications
7700 Emergency
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.