Aviation English
Emergencies

应答机代码7700 是什么？

应答机代码7700 The ATC transponder code universally set to indicate a general emergency, alerting controllers to an onboard emergency situation.

Source: ICAO Doc 9432, FAA PCG

How is “应答机代码7700” Used in Practice?

机组将应答机设置为7700代码，以声明紧急情况并提醒ATC。

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

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Frequently Asked Questions

应答机代码7700 是什么？

The ATC transponder code universally set to indicate a general emergency, alerting controllers to an onboard emergency situation.

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