What should a controller do if a clearance contains "IMMEDIATELY" or "EXPEDITE"?

When a clearance includes terms like "IMMEDIATELY" or "EXPEDITE," the pilot is being instructed to take urgent action, typically due to a safety concern or a need to manage air traffic effectively. In this context, the controller should provide the pilot with the reason for the expedited action if time allows. This helps to ensure that the pilot understands the urgency of the situation and can respond accordingly.

Providing the rationale behind an urgent instruction fosters effective communication between the controller and pilot, contributing to safety and operational efficiency. It helps the pilot make informed decisions and enhances situational awareness, which is crucial in high-stakes flying environments.

While notifying emergency services or increasing the aircraft's altitude are actions that might be necessary in certain situations, the primary focus in this scenario is on communication and understanding the urgency behind the controller's directives. Asking for confirmation from the pilot may also occur, but it is secondary to ensuring that the pilot comprehends the immediate nature of the clearance.