What should an airport issue if it falls below its ARFF index?

When an airport falls below its Aircraft Rescue and Fire Fighting (ARFF) index, issuing a NOTAM (Notice to Airmen) is the appropriate course of action. A NOTAM serves to inform pilots and other aviation personnel about any significant changes or hazards that could affect their operations. This includes information about the status of ARFF services, which is critical for ensuring safety during flight operations.

Issuing a NOTAM about the reduced ARFF capabilities allows airlines, pilots, and other stakeholders to make informed decisions regarding flight operations, such as adjusting schedules, taking alternate routes, or preparing for the potential need for increased precautions. This communication is vital for maintaining safety standards and compliance with regulatory requirements in aviation.

While other options might relate to passenger communications, operational safety reports, or public relations, they do not fulfill the specific requirement for notifying airmen of critical safety-related changes in airport services. The NOTAM directly targets the aviation community, ensuring that they are informed of the implications of the airport's lower ARFF capabilities.