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How shall a pilot inform a radar control unit that the aircraft is not equipped with transponder?
  • A
    Transponder not available.
  • B
    Negative squawk.
  • C
    Negative transponder.
  • D
    No SSR.

ICAO Doc 4444
12.4.3 Secondary surveillance radar (SSR) and ADS-B phraseologies

12.4.3.1 TO REQUEST THE CAPABILITY OF THE SSR EQUIPMENT

a) ADVISE TRANSPONDER CAPABILITY;
*b) TRANSPONDER (as shown in the flight plan);
*c) NEGATIVE TRANSPONDER.

* Denotes pilot transmission.

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