What three details must be communicated to the flight deck in case of a fire?

The correct choice emphasizes the need to provide specific information to the flight deck during a fire situation aboard the aircraft. Communicating the "Fire Type," "Source," and "Nature" allows for a clearer understanding of the situation at hand.

By identifying the fire type, the crew can determine the appropriate firefighting strategy and assess the potential hazards. For example, knowing whether it is an electrical fire or one caused by flammable materials can significantly influence how the crew responds.

Indicating the source gives the flight deck officers critical information on where the fire is located, which helps them coordinate emergency procedures effectively, including firefighting efforts and passenger safety protocols.

The nature of the fire involves understanding its behavior or characteristics—such as whether it is growing, stable, or reducing—allowing the flight crew to make real-time decisions about evacuation, landing, or using extinguishers.

This structured approach to communication is essential for ensuring passenger safety and managing emergencies professionally. The other options do not encapsulate these specific and critical details necessary for effective emergency response.