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The flight crew is suddenly subjected to unlawful interference by two hijackers while flying from Cairo to Larnaca. Without anyone noticing, the commander sets the transponder Mode A Code 7500. Is this action correct?
  • A
    No, the correct code would be Mode C Code 7500.
  • B
    No, the correct code would be Mode C Code 7700.
  • C
    No, the correct code would be Mode C Code 7600.
  • D
    Yes.

ICAO Annex 17 - Security

2.1.4.2.1 Code 7700 to provide recognition of an aircraft in an emergency.
2.1.4.2.3 Code 7500 to provide recognition of an aircraft which is being subjected to unlawful interference.

2.1.4.3 Appropriate provisions shall be made in ground decoding equipment to ensure immediate recognition of Mode A codes 7500, 7600 and 7700. (Note: code 7600 represents loss of communications).

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