What type of foam is specified by MIL-F-24385F for ARFF operations?

• A. Class B foam
• B. Aqueous film-forming foam (AFFF)
• C. Alcohol-resistant foam
• D. Free-flowing foam

Answer: (B)

The specification MIL-F-24385F outlines the requirements for Aqueous Film-Forming Foam (AFFF), which is specifically designed for use in Aircraft Rescue and Firefighting (ARFF) operations. AFFF is particularly effective at suppressing flammable liquid fires, as it forms a film on the surface of the burning liquid, cutting off the oxygen supply and homogenizing the fuel surface temperature. This characteristic allows AFFF to be highly effective against hydrocarbon fuels, which are commonly encountered in aviation incidents.

In the context of ARFF operations, the use of AFFF is critical because it not only extinguishes fires but also prevents re-ignition, providing increased safety for both firefighters and any affected individuals. The formulation and performance characteristics regulated by MIL-F-24385F ensure that AFFF meets the unique demands of airport environments where fuel spills and fires pose significant risks.

Other foam types might not possess the same effectiveness or appropriate properties needed for aviation fire scenarios, which is why AFFF is specifically emphasized and chosen for ARFF.