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What transponder mode and code should be used by an aircraft in a state of emergency?
  • A
    Mode C, Code 7600.
  • B
    Mode A, Code 7700.
  • C
    Mode A, Code 7500.
  • D
    Mode C, Code 7700.

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.

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

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