What critical information should be relayed to incoming ARFF units upon arrival?

The critical information that needs to be relayed to incoming ARFF (Aircraft Rescue and Firefighting) units upon arrival primarily revolves around the specifics of the incident. This includes the location of the incident, the type of aircraft involved, and the extent of the fire. Understanding the incident location helps units navigate directly to the scene without delay. Knowledge of the type of aircraft is crucial because different aircraft may have specific hazards, fuel types, and structural features that response teams must consider when formulating their firefighting strategy. Additionally, knowing the extent of the fire allows incoming units to assess the urgency and the resources required to effectively address the situation. This information is vital for the safety of both the first responders and any potential victims, ensuring that a coordinated and efficient response is initiated right from the start.

Other options, while they may contain relevant information, do not hold the same level of immediacy or critical nature as the aircraft type, location, and fire extent when it comes to effectively responding to an emergency call.