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Difficulty: MediumFires and Fire Extinguisher Use

A driver safely brings a commercial vehicle to a stop on the shoulder after detecting an under-hood engine fire and immediately switches off the ignition. What is the correct procedure for deploying a portable fire extinguisher to control this fire?

  1. A
    Fully raise the hood to locate the exact source of combustion before discharging the extinguishing agent.
  2. Keep the hood closed and discharge the extinguishing agent through the grille, side louvers, or from beneath the vehicle.Answer
  3. C
    Prop the hood open several inches and spray the extinguisher directly into the uppermost tips of the visible flames.
  4. D
    Spray water continuously through the hood latch seam while keeping vehicle accessories powered on.

Answer

Keep the hood closed and discharge the extinguishing agent through the grille, side louvers, or from beneath the vehicle.
Keeping the hood closed restricts the amount of oxygen reaching the fire. Discharging the extinguisher through the radiator grille, side louvers, or from underneath allows the chemical agent to reach the base of the fire safely without causing a sudden flare-up.

Step-by-Step Solution

1
Assess the engine fire enclosure
Recognize that the closed hood restricts the oxygen supply feeding the fire.
Maintaining an oxygen-limited environment prevents sudden flare-ups or flashover.
2
Direct the extinguishing agent through available openings
Discharge dry chemical or B:C rated agent through the front grille, louvers, or underside.
Shooting through existing body openings smothers the fire at its base without exposing the driver to sudden fireballs or introducing fresh air.

Key Concept

Engine fire containment and suppression techniques
Estimated Time:1m 0s
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Topics

Fires and Fire Extinguisher Use

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