What does 7700 mean on a transponder?

Aircraft in an emergency, who are not receiving an air traffic service should set the transponder to EMERGENCY (Mode 3A Code 7700) as part of their initial actions. A pilot may select Mode 3A Code 7700 whenever he has specific reason to believe that this would be the best course of action [ ICAO Doc 8168 Vol 1.]



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7777 is the transponder code for fighter jets carrying out an “active air defense mission”, i.e. an emergency interception.

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Series 20 — Code 2000 is to recognize an aircraft that has not received instructions from the air traffic control units to operate the transponder.

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Squawking 7700 in an emergency Reserved codes are used in particular situations when an aircraft wants to communicate something to ATC urgently. The most well know of these is the code 7700. This is used to indicate an emergency of any kind.

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The second emergency squawk code is 7600, showing ATC that the aircraft has lost verbal communication. This could mean that it can still hear ATC and yet not respond, in which case the ATC will direct the pilot to speak with them through the Ident button.

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For example, 1200 in the USA means that the flight is flying under Visual Flight Rules (VFR) and is not typically in direct contact with ATC. 1200 is a shared code so you may see many aircraft transmitting it at the same time in a given area.

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7000: Standard VFR transponder code to be used when no other code has been assigned. 7500: Aircraft hijacking. 7600: Radio failure. 7700: General Emergency.

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Code 7500 is the code for a hijack of an aircraft. When a pilot enters 7500 in a transponder, they can expect fighter jets to scramble and escort the aircraft to a base.

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The squawk code 7500 is an emergency code used by pilots to inform ATC of a plane hijacking taking place, which means that the pilots have either been forced to change course or are no longer in control of the aircraft.

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Famous Squawk codes These special codes are standardized by the International Civil Aviation Organization (ICAO), so seeing an emergency code in Denver means the same thing as seeing the code in Delhi. The first of these is the code 7500, which signals “unlawful interference,” more commonly referred to as hijacking.

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The 3 Must-Know Aircraft Emergency Squawk Codes For Pilots
  • 7700 – Distress or Urgency Condition. Before we begin discussing emergencies, let's define our terms as listed in the Pilot/Controller Glossary. ...
  • 7600 – Two-Way Radio Communication Failure (NORDO) ...
  • 7500 – Air Piracy (Hijacking or Hostile Acts Onboard)


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