🔍 Key Concepts

• 46 CFR requirements for uninspected vessels and what types of fires are most likely on gasoline or diesel-powered motor vessels • The basic meanings of fire extinguisher classifications A, B, C, D (what type of fuel each is designed for) • Which extinguisher class the Coast Guard focuses on for portable extinguishers aboard motor vessels

💭 Think About

• First, recall what each fire class (A, B, C, D) is used for in general fire science, then ask: which type of fire is the primary concern on a motor vessel? • Think about the most common fuels on an uninspected motor vessel (e.g., fuel, oil, electrical equipment, etc.) and match that risk to the extinguisher class the CG specifies. • Consider whether the regulation is asking about the primary required rating for the extinguisher, not every possible extra rating it might also carry.

✅ Before You Answer

• Verify in 46 CFR Part 25 (requirements for uninspected vessels) which extinguisher class is specified for portable extinguishers on motor vessels. • Check that the class you pick directly addresses flammable liquid fires often found in engine compartments and fuel systems, if applicable. • Confirm that the regulation names one specific extinguisher class for the requirement, even though in practice many extinguishers are multi-purpose (e.g., combination ratings).