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6
GTN 625/635/650 Cockpit Reference Guide
190-01004-04 Rev. N
Transponder
TCAS II Transponder Mode Controls
The GTN can also control the modes of a TCAS II system through a GTX
3000. The TA Only and TA/RA modes are added to the transponder control
panel. Selecting TA Only or TA/RA will command the TCAS into the selected
mode, but depending on the aircraft configuration (e.g., on ground), the TCAS
may remain in a different mode.
Special Squawk Codes
The selected squawk code will always be in use. As you change a squawk
code, the original code will be sent until you are finished selecting the new
code.
The table below lists special squawk codes:
Squawk Code
Description
1200
Default VFR code in the USA
7500
Hijacking
7600
Loss of Communications
7700
Emergency
Special Squawk Codes
NOTE:
While 1200 is the default VFR squawk code, the installer can configure
any code to the VFR key. This is to support international operations where
1200 may not be used.