Definition
The four-digit transponder code 7700, set by a pilot to alert air traffic control that the aircraft is experiencing a general emergency. When 7700 is selected on the transponder, the aircraft's symbol on ATC radar displays is highlighted with a distinct alert, prompting controllers to provide priority handling and any assistance needed.
Plain English
7700 is the number a pilot dials into the transponder to tell air traffic control 'I have an emergency.' It makes the aircraft stand out on the controller's radar screen so they immediately know help is needed.
Context Anchor
Encountered during abnormal and emergency procedures, especially when communicating with air traffic control or when a pilot needs to make the aircraft’s emergency status clear on radar.
Derivation
Squawk comes from the World War II identification system code-named 'Parrot,' so telling a pilot to activate the transponder became 'squawk.' The number 7700 was assigned internationally as the universal emergency code; it is easy to remember and unlikely to be selected by accident.
Why Pilots Care
It triggers immediate ATC priority, airspace clearance, and coordination with emergency services without needing radio contact.
Grounding Statement
Selecting 7700 causes the aircraft's radar return to flash on controller screens as an emergency alert.
Intuition Check
“Squawk” does not mean making a noise here. In this context, it means selecting a specific transponder code so air traffic control can identify your aircraft’s status.
Example Sentence 1
After the engine began running rough over mountainous terrain, the pilot squawked 7700 and told ATC he needed the nearest airport.
Example Sentence 2
Controllers saw the 7700 code appear and immediately cleared other traffic from the area.