When is an aircraft station allowed to use its abbreviated call sign ?

Question

Question ATPL - Airline Transport Pilot license - VFR Communications

QuizVDS · Accepted Answer

After it has been addressed in this manner by the aeronautical ground station

QuizVDS · Answer

Only after satisfactory communication has been established

QuizVDS · Answer

In dense traffic

QuizVDS · Answer

Provided no confusion is likely to result

Id 112 - ATPL - When is an aircraft station allowed to use its abbreviated call sign ?