What should be confirmed about the PO2 mask and tubing during a preflight check?

• A. Damaged
• B. Mask and tubing in good condition and securely plugged into outlet
• C. Too many units
• D. No gauge

Answer: (B)

Confirming that the mask and tubing of the positive pressure oxygen (PO2) system are in good condition and securely plugged into the outlet is vital for ensuring safety during flight operations. This check is crucial because any damage, such as cracks or leaks in the mask or tubing, could result in a failure to deliver the necessary oxygen supply in an emergency situation. Additionally, if the mask and tubing are not properly connected to the outlet, it may not function effectively, potentially exposing crew and passengers to hypoxia. Therefore, ensuring that everything is secure and undamaged helps maintain operational integrity and safety standards on board.