Why should the engine compartment be kept shut during a fire?

• A. To prevent fresh air from feeding the fire
• B. To vent extinguishing agents
• C. To keep the compartment cool
• D. To allow more fuel into the space

Answer: (A)

Keeping the engine compartment shut during a fire starves the flames of fresh air. Fire needs oxygen to keep burning, so sealing the space slows or stops combustion, limits heat and smoke, and helps prevent the fire from spreading to other areas. It also reduces the chance that fuel vapors and hot gases will be drawn into adjacent compartments or back into the crew areas when vents or hatches are opened. Ventilation is best controlled and used only when the fire is under control and in a planned manner.