Which are the four foam application methods used in UHP operations?

• A. Fog, straight stream, spray, drizzle
• B. Roll-on, bank-down, base-of-the-fire, and rain-down
• C. Wet, dry, chemical, aerated
• D. Drip, soak, spray, flood

Answer: (B)

In UHP foam operations, four methods are used to place the foam effectively and control the fire: roll-on, bank-down, base-of-the-fire, and rain-down. Roll-on pushes foam along the surface to create a thick, rolling blanket over the fuel, rapidly covering large areas and helping to suppress vapors. Bank-down directs the foam stream to form a bank that cascades onto the fire from above, useful for reaching elevated areas and creating a protective barrier. Base-of-the-fire applies foam at the fuel source, cooling and smothering the flame by blanket formation at the base. Rain-down releases foam as a fine spray from above to blanket and cool the area quickly, aiding rapid vapor suppression and coverage. These methods together address different fuel configurations and fire geometries typical of aircraft incidents.