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When may the name of the location or the call sign suffix in the call sign of an aeronautical station be omitted?
  • A
    Only after the aeronautical station has used the abbreviated call sign.
  • B
    The call sign suffix should be used in radiotelephony communication under any circumstances when calling an aeronautical station.
  • C
    When satisfactory communication has been established and provided it will not be confusing to do so.
  • D
    In dense traffic during rush hours.

An example would be:

Initially: use the location and station type (call sign suffix), 'Heathrow Tower'

Later: Use either just 'Heathrow' or 'Tower', omitting the other word.

This question refers to the aeronautical station, not to the call signs for aircraft. Below you can find an excerpt from ICAO Annex 10 which refers to this question:

5.2.1.7.1 Radiotelephony call signs for aeronautical stations [...]
5.2.1.7.1.2 ... the name of the location or the unit/service may be omitted provided satisfactory communication has been established.

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