Definition
An instruction or action by which a pilot sets the aircraft transponder to code 7700, the universal emergency code, causing the aircraft's radar return to be flagged on every air traffic control display as an aircraft in distress.
Plain English
Set your transponder to the number 7700. This tells every air traffic controller within range that you have an emergency.
Context Anchor
Used during emergency procedures, including abnormal situations during highly automated operations such as autoland.
Derivation
Squawk' came from a World War II identification system codenamed 'Parrot,' so telling an aircraft to identify itself became 'squawk.' The term carried over to civilian transponder codes. 7700 was chosen as the emergency code because it produces a distinctive pattern that radar systems and controller displays are programmed to highlight immediately.
Why Pilots Care
It triggers immediate ATC assistance, clears the aircraft for any altitude or routing needed, and prompts search-and-rescue coordination if contact is lost.
Grounding Statement
Selecting 7700 makes the aircraft show up to controllers as an emergency aircraft.
Intuition Check
“Squawk” does not mean make a voice call here. It means set the transponder code; 7700 is the emergency code.
Example Sentence 1
After losing engine power, the pilot squawked 7700 and turned toward the nearest airport.
Example Sentence 2
ATC cleared all other traffic when the aircraft suddenly squawked 7700 on approach.