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When is a pilot allowed to change his/her callsign from the callsign entered at item 7 of his/her flight plan to his/her aircraft registration?
  • A
    When instructed to by ATC only, which will be temporary, in the interests of safety.
  • B
    Following an approved request to ATC.
  • C
    Whenever you consider it necessary.
  • D
    This is never allowed.

ICAO Annex 10, Volume II
5.2.1.7.3 Radiotelephony procedures

5.2.1.7.3.1 An aircraft shall not change the type of its radiotelephony call sign during flight, except temporarily on the instruction of an air traffic control unit in the interests of safety.

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