USCG Basic Damage Control Practice Exam

Jettisoning is the most effective method for extinguishing a Class D fire, which involves combustible metals such as magnesium, titanium, and sodium. These types of fires can’t be fought effectively with water or traditional extinguishing agents, as they can react violently when exposed to moisture, exacerbating the fire.

Jettisoning refers to the act of removing the burning material from the area, effectively eliminating the fuel source that is sustaining the fire. This method is particularly useful in scenarios where the burning material is contained and can be safely removed without risk of further ignition or injury.

Other methods, such as coolant application, foam application, and carbon dioxide dispersion, are not effective against Class D fires. Coolants and foams can interact with the burning metal to produce hazards or even escalate the fire, while carbon dioxide, which is effective for some other classes of fire, does not suppress the unique chemical reactions associated with combustible metals. Therefore, jettisoning stands out as the safest and most effective means to extinguish a Class D fire by removing the hazard altogether.