Definition
A function of an air traffic control radar beacon system (ATCRBS) transponder that allows the pilot to change the operating mode of the transponder, selecting which type of interrogation the transponder will reply to and what information it will send back to the ground radar.
Plain English
A way for the pilot to change the setting on the transponder so it sends a different kind of reply to the radar on the ground.
Context Anchor
Used when air traffic control assigns a new transponder code, or when a pilot must select a special code such as an emergency code.
Derivation
‘Code’ here refers to the reply codes the transponder sends to ATC radar; ‘switching’ means changing between them. The term simply describes the act of switching which code or mode the transponder is set to.
Why Pilots Care
Helps prevent miscommunication on the radio without abandoning the safety of standardized phraseology.
Intuition Check
Code switching does not mean changing languages or radio wording here. In this aviation use, it means changing the aircraft’s selected transponder code.
Example Sentence 1
After takeoff, the pilot used code switching to move the transponder from standby into Mode C so ATC could see the aircraft’s altitude.
Example Sentence 2
During the handoff the controller practiced code switching to confirm the student pilot understood the new heading.