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Difficulty: MediumFires and Fire Extinguisher Use

While transporting dry freight along an industrial corridor, you detect smoke emerging from your truck's engine compartment. After pulling off the roadway into an open area away from buildings and shutting down the engine, you prepare to fight the fire with your portable extinguisher. What is the correct procedure for suppressing this engine fire?

  1. A
    Fully unlatch and tilt the hood open to directly expose and douse the source of the fire.
  2. B
    Discharge water directly onto the alternator and fuse block before using a dry chemical extinguisher.
  3. Keep the hood closed and shoot the extinguishing agent through the grille, louvers, or from underneath the vehicle.Answer
  4. D
    Direct the extinguisher stream high into the air above the vehicle to smother rising flames from above.

Answer

Keep the hood closed and shoot the extinguishing agent through the grille, louvers, or from underneath the vehicle.
When confronting an engine compartment fire, keeping the hood closed prevents a rush of oxygen from accelerating the fire. Discharging the extinguisher through the radiator grille, side louvers, or from underneath the cab allows the extinguishing agent to reach and smother the base of the fire safely.

Step-by-Step Solution

1
Maintain oxygen starvation by leaving the engine hood closed.
Prevents a rush of fresh oxygen from causing a sudden flashover or flare-up.
Commercial vehicle engine compartments trap heat and combustible gases; opening the hood introduces atmospheric oxygen that accelerates the fire.
2
Direct the chemical extinguisher through exterior entry points (grille, louvers, or from underneath) at the base of the fire.
Smothers the flames at the fuel source while protecting the driver from direct heat and flashback.
Proper fire containment protocol requires aiming at the base of the burning material without opening access panels.

Key Concept

Engine fire containment and safe extinguisher application
Estimated Time:1m 0s
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Topics

Fires and Fire Extinguisher Use

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