How many classes of fires are recognized in aviation firefighting?

In aviation firefighting, there are four recognized classes of fires, which are classified based on the types of materials that are burning. Understanding these classes is crucial for effective firefighting techniques and for ensuring the safety of personnel and equipment.

The first class pertains to fires involving ordinary combustibles, such as wood and paper. The second class includes flammable liquids, such as fuels and oils. The third class is focused on fires caused by energized electrical equipment, and the fourth class deals with fires involving combustible metals, which require specific extinguishing agents that are different from those used for other classes.

These classifications help firefighters determine the appropriate firefighting methods and extinguishing agents required to control and extinguish the fire effectively, ensuring both efficiency and safety while minimizing damage.