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A crew has suffered an inextinguishable engine fire, they are in imminent danger from the fire spreading further. They also require immediate assistance to land. What is their condition, and which SSR code must they set?
  • A
    Distress and 7700.
  • B
    Distress and 7500.
  • C
    Urgency and7600.
  • D
    Urgency and7700.

Distress messages. This message category shall comprise those messages sent by mobile stations reporting that tthey are threatened by grave and imminent danger and all other messages relative to the immediate assistance required by the mobile station in distress.

Urgency messages. This category shall comprise messages concerning the safety of a ship, aircraft or other vehicles, or of some person on board or within sight.

SSR CODES

• 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")

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.

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