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An aircraft call sign can be abbreviated after satisfactory communication has been established, no confusion is likely to arise, and...
  • A
    after the abbreviated call sign has been used by the ground station.
  • B
    if the aircraft station deems it necessary to call the ground station with its abbreviated call sign.
  • C
    if there are a lot of other communications on the frequency.
  • D
    after the aircraft station and ground station agree to use the abbreviated call sign.

Radiotelephony call signs for aircraft

To avoid confusion, all aircraft stations own a call sign. This call sign is used for communication with the ATS units. The call sign should be unique and shall not be changed during the flight except for safety reasons or if it considered necessary for some reason. Abbreviated radiotelephony call signs shall be used only after satisfactory communication has been established and provided that no confusion is likely to arise. An aircraft shall use its abbreviated call sign only after it has been addressed in this manner by the aeronautical station.

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