USCG Exam PracticeFirefighting, damage control, and emergency response
When a fire is discovered in a vessel's machinery space, what is the correct first action regarding the ventilation system?
- A. Increase ventilation to clear smoke and improve visibility for firefighting.
- ✓ Shut off ventilation to the affected space to cut off the air supply to the fire.Correct
- C. Redirect ventilation to adjacent spaces to prevent spread of heat.
- D. Maintain normal ventilation until the fixed extinguishing system is activated.
Why B is correct
Per 46 CFR §185.512(a)(3)(i) and the Boatswain's Manual Ch. 6 §6.3, cutting off the air supply by closing hatches, ports, doors, ventilators, and louvers and shutting off the ventilation system is a required early action. For machinery space fires specifically, fuel supply and ventilation must be shut off before activating any fixed extinguishing system.