While navigating a loaded tractor-trailer down a steady grade, you observe thick smoke emerging from the front of your vehicle. You execute a safe pull-over, secure the parking brakes, and cut the engine power. Armed with your mandated 10 B:C dry chemical fire extinguisher, how should you proceed to safely neutralize the engine compartment fire?
- Maintain a closed hood to prevent oxygen from feeding the fire, and discharge the extinguishing agent through the radiator grille, louvers, or from beneath the vehicle while aiming at the fire's base.Answer
- BUnlatch the hood and prop it open partially to gain a direct line of sight to the burning components, then sweep the dry chemical agent directly across the visible flames to smother them.
- CRefrain from using the 10 B:C extinguisher, as the presence of burning plastic hoses and rubber belts constitutes a Class A fire that strictly requires a pressurized water extinguisher to extinguish safely.
- DLeave the hood securely latched and deploy the extinguishing agent through the front louvers, but aim the nozzle at the highest point of the smoke and flames to force the fire downward and starve it of oxygen.
Answer
The correct response is to keep the hood closed to restrict oxygen and apply the extinguishing agent through the grille or louvers, aiming directly at the base of the fire.
Keeping the hood closed deprives the fire of additional oxygen, which is one of the three critical elements a fire needs to burn. By shooting the extinguishing agent through the louvers or from underneath the vehicle and aiming at the base of the fire, the driver effectively attacks the fuel source without risking a dangerous flare-up.
Step-by-Step Solution
Key Concept
Engine Fire Containment and Extinguisher Application
Estimated Time:1m 30s