What classification of fire includes combustible metals such as magnesium and lithium?

The classification of fire that includes combustible metals such as magnesium and lithium is Class D. This classification is specifically designated for fires involving combustible metals, which behave differently than other materials due to their unique chemical properties.

Class D fires are particularly hazardous because they cannot be extinguished with water or standard fire extinguishing agents; instead, special dry powder agents are required to smother and extinguish these types of fires. This is crucial for safety, as using water can lead to violent reactions with certain metals.

The other classifications focus on different types of materials: Class A involves ordinary combustible materials like wood and paper, Class B is for flammable liquids and gases, and Class C is for electrical fires. Recognizing and understanding these classifications is vital for properly responding to and extinguishing fires involving different types of materials in aerospace and other fields.