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What is the call sign to be used at first radio contact?

  • A

    Using the first three characters only.

  • B

    Using the last two characters only.

  • C

    Using the first two characters only.

  • D

    Using all characters.

Refer to figure.
ICAO Annex 10 Volume II - Aeronautical Telecommunications
5.2.1.7.3.2 Establishment of radiotelephony communications

5.2.1.7.3.2.1 Full radiotelephony call signs shall always be used when establishing communication. The calling procedure of an aircraft establishing communication shall be in accordance with Table 5-2.


At first radio contact, all characters of the aircraft call sign should be used to avoid confusion and misunderstandings.

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