Aviation abbreviation
Transponder code instruction
At a glance
Meaning of Transponder code instruction
An instruction to select a transponder code or operating function.
More about Transponder code instruction
A controller may assign a code so that the aircraft can be associated with its surveillance information.
Transponder codes and operating modes serve different purposes. Crews apply the assigned instruction and relevant procedures; the word squawk does not refer to passenger communication or an ordinary radio call sign.