The AARs use a radio communication system (not flags) to communicate with the referee. If the radio communication system fails to work, the AARs will use an electronic signal beep flagstick. AARs do not usually use obvious hand signals but, in some instances, a discreet hand signal may give valuable support to the referee. The hand signal should have a clear meaning and such signals should be agreed in the pre-match discussion.
The AAR, having assessed that the ball has wholly passed over the goal line within the goal, must:
immediately inform the referee via the communication system that a goal should be awarded
make a clear signal with the left arm perpendicular to the goal line pointing towards the centre of the field (flagstick in the left hand is also required). This signal is not required when the ball has very clearly passed over the goal line.
The referee will make the final decision.