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202. What is the preferred agent used in fighting a helicopter crash fire?
Foam is the preferred extinguishing agent for helicopter crash fires because it smothers the fuel and prevents re-ignition. This is crucial for Class B (flammable liquid) fires involving large fuel spills, unlike gaseous agents which dissipate quickly and water which can spread the fuel. Foam effectively blankets the fuel, excluding oxygen and sealing vapors, making it the standard choice for helidecks and similar facilities.
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