The Water Fire Extinguisher on the CRJ 200 is designed for Class A fires.

• A. True
• B. False
• C. Not Applicable
• D. Both A and B

Answer: (A)

The key idea here is that water extinguishers are suited for Class A fires because they cool the fuel to below its ignition temperature. Water works by absorbing a lot of heat as it heats up and turns to steam, which slows or stops the combustion of ordinary combustibles like wood, upholstery, fabrics, paper, and other materials commonly found in an aircraft cabin. Because Class A fires involve these materials, a water extinguisher is effective.

It’s not appropriate for Class B fires (flammable liquids) because water can spread the liquid and worsen the fire, and it’s not ideal for electrical (Class C) fires since water conducts electricity and can increase risk to crew and equipment. On the CRJ 200, the water extinguisher is provided specifically for Class A fires, which aligns with its cooling action and the typical cabin materials present.