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An aircraft is squawking 7600. What does it indicate?
  • A
    It is requesting immediate level change.
  • B
    It is about to make a forced landing.
  • C
    It is diverting to the alternate aerodrome.
  • D
    It is unable to establish communication due to radio equipment failure.

ICAO Doc 4444
8.5.2 SSR code management

8.5.2.1 Codes 7700, 7600 and 7500 shall be reserved internationally for use by pilots encountering a state of emergency, radiocommunication failure or unlawful interference, respectively.


Use the following mnemonics:
• Code 7500 = Unlawful interference ("75 - man with a knife")
• Code 7600 = Radio failure ("76 - I need a radio fix")
• Code 7700 = Emergency/distress ("77 - going to heaven")


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