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  • Mode S All Call

    Hi,

    I am currently revising SSR and Mode S transponders. Having looked at the learning objectives it states the following "State that the Aircraft Address shall be transmitted in any reply except in Mode S only all call reply". However, I am reading a Euro Control document that says "The Mode S only all-call interrogations with the ICAO aircraft address of '1111 1111 1111 1111 1111 1111' (aircraft reply with their own 24-bit ICAO Aircraft Address)".

    This appears to contradict the LO unless I am missing something obvious.

    Can someone explain? It would be much appreciated

    Regards,

    Liam

  • #2
    I agree. I think the error is in the objective.

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    • #3
      EASA have acknowledged the error and inform me that current questions 'make no reference to the spurious aspect of this learning objective'. The objective will be deleted in the new syllabus.

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