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ATC observes that an aircraft in their sector has recently altered its assigned squawk code, transitioning from 2000 to 7600. What does this change indicate?
  • A
    The Pilot will declare a Mayday.
  • B
    Communication failure.
  • C
    Unlawful interference.
  • D

    The Pilot has changed from a standard code to a discrete code.

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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