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Difficulty: EasyFires and Fire Extinguisher Use

While operating a tractor-trailer on the highway, you observe smoke coming from the engine compartment, safely pull off the roadway, and turn off the engine. When preparing to extinguish an engine compartment fire, which action should you take?

  1. A
    Open the hood completely to locate the base of the fire before discharging the extinguisher.
  2. Spray the fire extinguisher through the radiator grille or side louvers without lifting the hood.Answer
  3. C
    Douse the engine electrical components and wiring with water before using a chemical agent.
  4. D
    Pump the brake pedal rapidly to dissipate under-hood friction heat while preparing the extinguisher.

Answer

Spray the fire extinguisher through the radiator grille or side louvers without lifting the hood.
During an engine fire, the hood should remain closed to starve the fire of oxygen. The extinguisher nozzle should be aimed through louvers, the radiator grille, or from underneath the vehicle directly at the base of the fire.

Step-by-Step Solution

1
Identify the proper containment protocol for commercial vehicle engine fires.
Keep the hood latched and closed to prevent introducing fresh oxygen to the flames.
Restricting oxygen helps smother the fire and protects the driver from sudden flare-ups.
2
Apply the dry chemical extinguishing agent into the enclosed space.
Direct the nozzle through exterior openings such as the grille, louvers, or from beneath the vehicle.
This safely delivers the extinguishing agent to the source without creating a burst of flames.

Key Concept

Engine Fire Containment and Extinguisher Application
Estimated Time:45s
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Topics

Fires and Fire Extinguisher Use

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