What is the purpose of closing ventilation lines during a cabin fire?

• A. To isolate the affected area and limit spread of smoke.
• B. To improve cabin comfort.
• C. To increase air quality by bringing fresh air.
• D. To reduce noise.

Answer: (A)

When a cabin fire occurs, shutting the ventilation lines serves to contain the problem by stopping the crossflow of air that can carry heat and smoke from the fire zone into other areas. This isolation slows the fire by limiting the oxygen supply and prevents smoke from spreading through the cabin ducts, helping keep escape routes and nearby areas clearer for passengers and crew. It also makes firefighting and evacuation more manageable by concentrating the smoke and heat in a smaller zone.

This isn’t about comfort or bringing in fresh air, which would feed the fire, and it isn’t about reducing noise. The main aim is to limit the spread of smoke and fire by controlling the airflow.