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An aircraft call sign may be abbreviated when communication has been (1) _____ and (2) _____ is likely to occur.

  • A
    (1) attempted; (2) as little confusion as possible.
  • B
    (1) attempted; (2) an error.
  • C

    (1) established; (2) NO error.

  • D
    (1) established; (2) NO confusion.
  • ATS has the discretion to shorten some call signs, but not all. Pilots must use the full call sign when establishing communication with a station, and they cannot abbreviate it until ATC has done so first. When there is no possibility of confusion, and communication has been established, abbreviated radiotelephony call signs may be used.

ICAO Annex 10
5.2.1.7.3.3 Subsequent radiotelephony communications

5.2.1.7.3.3.1 Abbreviated radiotelephony call signs, as prescribed in 5.2.1.7.2.2, shall be used only after satisfactory communication has been established and provided that no confusion is likely to arise. An aircraft station shall use its abbreviated call sign only after it has been addressed in this manner by the aeronautical station.

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