May ask an aircraft to temporarily change its call sign for safety reasons when there is a risk of confusion between two or more similar call signs. |
Must not ask an aircraft to change its call sign. |
May require to change the call sign for safety reasons when there is a risk of confusion between two or more similar call signs providing the aircraft is on a repetitive flight plan. |
May not ask an aircraft to change its call sign after accepting the flight plan. |
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