Skip to content
Define AviationCFI lesson plans to teach aviation lessons

SQUAWK (Mode, Code, Function)

ATC & Communications

All definitions
« Back to Glossary Index

Used by ATC to instruct a pilot to activate the aircraft transponder and ADS-B Out with altitude reporting enabled, or (military) to activate only specific modes, codes, or functions.

Source FAA Pilot/Controller Glossary · checked 2026-08-25

« Back to Glossary Index

More in ATC & Communications

Enjoying Define Aviation ad-free?

Chip in and ads disappear right away in this browser — cancel anytime, no account needed.

Secure checkout via Stripe — Apple Pay, Google Pay, and cards.