Squawk 7700

Squawk 7700 is the transponder code used to indicate an emergency when the aircraft has not been assigned a more specific code or instructed otherwise. Selecting 7700 makes the emergency status visible to air traffic control radar systems that receive the aircraft's transponder signal.

What it governs

The code is an alerting aid, not a substitute for communication. When able, the pilot transmits the nature of the emergency, intentions, position, altitude, and other useful information. The appropriate response depends on the situation, available communications, and ATC instructions. A pilot should use the aircraft's emergency checklist and applicable procedures.

A transponder code can be selected accidentally or can remain set after an event. Pilots should verify the code and mode before and during flight as required by the aircraft's procedures. If a controller assigns a discrete code for a particular emergency, that instruction takes precedence over a general explanation.

Example

If an aircraft develops an emergency and the pilot cannot immediately establish or maintain two-way communication, selecting 7700 can alert ATC while the pilot works the checklist. If communication is available, the pilot should make the appropriate radio call as soon as workload permits.

Why it matters

The code helps ATC identify aircraft needing priority or assistance, but it does not explain the problem. ATC still needs the pilot's situation and intentions when the pilot can provide them. A transponder failure, radio failure, and unlawful interference have different procedures and codes.

Review the current FAA Aeronautical Information Manual and aircraft operating handbook for the applicable procedure. This entry is a reference definition, not an emergency checklist.

Related terms and tools

• Squawk 7600
• Squawk 7500
• FAA Pilot and Controller Glossary