If NORDO and already established on course rules arrival, what should you do?

When a pilot is experiencing a NORDO (no radio communication) situation and is already on the established arrival course, the appropriate action is to continue on arrival. This is based on the assumption that the pilot is aware of their position and the clearance previously received and is in a situation where they can safely complete the flight without further instructions.

Continuing on arrival allows the pilot to maintain the established flight path, which is crucial for the safety and efficiency of air traffic management. It indicates that the pilot intends to follow the standard procedures that apply to the approach they are on, which helps to avoid confusion and ensures they remain in safe alignment with other traffic.

The other options generally imply actions that would be used in different contexts or when establishing communication is possible. For instance, rocking wings or executing a normal break might signal a problem but could lead to unnecessary complications in a NORDO scenario where maintaining a steady flight path is critical. Circling back to approach could disrupt air traffic and is not conducive to the most efficient resolution of a NORDO situation. Thus, the most straightforward and safety-oriented action in this context is to continue on arrival.