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You are instructed by ATC to set squawk 4414, but then have a radio failure. What do you do?

  • A

    Maintain the squawk 4414.

  • B

    Squawk 7600 for radio failure.

  • C

    Maintain 4414 until a level change and then change to 7600.

  • D

    Turn your transponder to standby.

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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