Which action should be avoided to prevent smoke from entering the cabin?

Which action should be avoided to prevent smoke from entering the cabin?

• A. Opening the flight deck door
• B. Closing the flight deck door
• C. Keeping the door closed
• D. Opening all doors

Answer: (C)

Keeping the flight deck door closed is essential because it creates a strong barrier between the cockpit and the cabin, limiting smoke migration. Smoke moves with air and pressure differences, so opening the door provides a direct path for smoke to flow into the cabin regardless of where it originates. Keeping the door closed minimizes those cross-currents and helps protect passengers from smoke exposure while the crew works to manage the situation. Opening any door or leaving doors open would remove that barrier and allow smoke to spread more readily, making the cabin harder to breathe and harder to control the environment.