Definition
The four-digit transponder code (squawk 7700) used by a pilot to indicate a general emergency. When set on the aircraft transponder, it triggers an immediate alert on air traffic control radar displays, identifying the aircraft as being in distress and prompting controllers to provide priority handling and assistance.
Plain English
A special four-number setting on the aircraft's transponder that tells air traffic control, 'I have an emergency.' Once selected, controllers see the aircraft flagged on their screens and respond right away.
Context Anchor
Seen in emergency procedures, including helicopter inadvertent IMC situations when the pilot enters clouds or poor visibility unintentionally and needs immediate help.
Derivation
Transponder comes from transmit and respond: it sends back a reply when it receives a radar signal. Code means a selected number that carries a specific meaning to air traffic control. In this case, 7700 is the number assigned to a general emergency.
Why Pilots Care
It triggers immediate ATC priority, traffic separation, and possible rescue coordination without needing voice communication.
Intuition Check
7700 is not a radio frequency and it is not a private password. It is a transponder setting that tells air traffic control, “This aircraft has an emergency.”
Example Sentence 1
After losing engine power, the pilot dialed transponder code 7700 and declared an emergency with the nearest controller.
Example Sentence 2
Squawking 7700 allowed ATC to clear a direct path to the nearest airport.