If a fire/smoke is not immediately extinguished, what additional actions should happen?

If a fire/smoke is not immediately extinguished, what additional actions should happen?

• A. Put on additional clothing and PBE
• B. Move portable oxygen cylinders away
• C. Close vents to prevent smoke from entering cabin
• D. Instruct passengers to breathe where there isn't much smoke (near floor)

Answer: (C)

The main idea is to limit how far and how fast smoke can travel through the aircraft by controlling the ventilation system. When a fire or smoke is not immediately extinguished, shutting off or reducing airflow through cabin vents and the environmental control system helps slow the spread of smoke from the source to other areas, preserves breathable air where it’s most needed, and makes it easier for the crew to manage the situation and locate the fire. Closing the vents cuts the pathways that would otherwise pull in outside air and push smoke through compartments. This containment buys time for the crew to address the fire, perform necessary checks, and evacuate if needed, while keeping some areas clearer for passengers and crew to breathe more easily. Other actions, like donning protection, moving oxygen cylinders, or instructing passengers to breathe near the floor, are part of the broader safety response but do not directly prevent the smoke from spreading as effectively as controlling the ventilation does. Closing vents is the most effective immediate step to limit smoke intrusion and maintain control of the environment.

The main idea is to limit how far and how fast smoke can travel through the aircraft by controlling the ventilation system. When a fire or smoke is not immediately extinguished, shutting off or reducing airflow through cabin vents and the environmental control system helps slow the spread of smoke from the source to other areas, preserves breathable air where it’s most needed, and makes it easier for the crew to manage the situation and locate the fire.

Closing the vents cuts the pathways that would otherwise pull in outside air and push smoke through compartments. This containment buys time for the crew to address the fire, perform necessary checks, and evacuate if needed, while keeping some areas clearer for passengers and crew to breathe more easily.

Other actions, like donning protection, moving oxygen cylinders, or instructing passengers to breathe near the floor, are part of the broader safety response but do not directly prevent the smoke from spreading as effectively as controlling the ventilation does. Closing vents is the most effective immediate step to limit smoke intrusion and maintain control of the environment.