What types of fire extinguishers are typically found on the ramp, and when should they be used?

• A. Class A extinguishers for ordinary combustibles; use for all fires.
• B. Dry chemical extinguishers are best for all aircraft fires.
• C. Class B extinguishers for flammable liquids and Class C for electrical equipment; use the appropriate extinguisher for the fire class.
• D. Water mist extinguishers are used for general purposes.

Answer: (C)

The main idea is that extinguishers are classified to handle specific fire types, and ramp environments present fires involving flammable liquids and electrical equipment. Class B extinguishers are designed for flammable liquids such as fuels and oils, and they work by smothering the flame and separating the fuel from the air. Class C extinguishers are safe for use on energized electrical equipment because their agents are non-conductive and won’t create a shock hazard. On the ramp, you’re most likely dealing with fuel spills or leaks and with electrical systems, so having extinguishers labeled for these classes and choosing the one that matches the fire you see is the correct approach. Using an extinguisher not suited to the fire type—like water on a fuel or electrical fire—can make the fire worse or create additional hazards.