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A
I hereby indicate that all stations shall omit read-backs.
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B
I hereby indicate the separation between messages transmitted to different aircraft in a very busy environment.
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C
I hereby indicate that an urgent message has to be transmitted by any receiving station to another station with which radiocommunication has previously been broken.
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D
I hereby indicate that an incident has occurred and that I will shortly cease to provide Air Traffic Services.
ICAO Annex 10, Volume II
Chapter 5. Aeronautical Mobile Service - Voice Communications
BREAK - “I hereby indicate the separation between portions of the message.” (To be used where there is no clear distinction between the text and other portions of the message.)
BREAK BREAK - “I hereby indicate the separation between messages transmitted to different aircraft in a very busy environment.”
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