Section 913
GARMIN GTX 327Transponder
913 - 4 Page Date: 19. February 2014
Pilot´s Operating Handbook US
EXTRA 330LX
ALT
Powers on the transponder in Mode A and Mode C. At power on the last active identification code
will be selected. In ALT mode, the transponder replies to identification and altitude interrogations,
as indicated by the Reply Symbol. Replies to altitude interrogations include standard pressure
altitude received from a separate encoder.
913.1.2 CODE SELECTION
Code selection is done with eight keys (0 - 7) that provide 4,096 active identification codes. Pushing
one of these keys begins the code selection sequence. The new code will not be activated until the
fourth digit is entered. Pressing the CLR key will move the cursor back to the previous digit. Pressing
the CLR key when the cursor is on the first key of the code, or pressing the CRSR key during code
entry, will remove the cursor and cancel data entry, restoring the previous code. The numbers 8 and
9 are not used for code entry, only for entering a Count Down time, and in Configuration Mode.
IMPORTANT CODES:
1200 The VFR code for any altitude in the US (Refer to ICAO standards elsewhere)
7500 Hijack code (Aircraft is subject to unlawful interference)
7600 Loss of communications
7700 Emergency
7777 Military interceptor operations (Never squawk this code)
0000 Military use (Not enterable)
Care should be taken not to select the code 7500 and all codes in the 7600-7777 range, which
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.
913.1.3 KEYS FOR OTHER GTX 327 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.
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