If you notice a door in the armed mode during your preflight check, what should you do?

When a door is found to be in the armed mode during the preflight check, it is crucial to immediately disarm the door. The armed status indicates that the emergency slide is ready for deployment, which should not be the case during preflight checks, as the aircraft is not yet ready for takeoff and should not have emergency slides armed. Disarming the door ensures that safety protocols are observed, minimizing the risk of accidental deployment of the slide which can occur if the door is opened in this state.

This action is part of the safety protocols designed to protect both crew and passengers. By disarming the door at this stage, you help ensure that the aircraft is secure and safe for its intended operations. Notifying only the flight attendants or filing a report later would not address the immediate safety concern that arises from a door being armed when it shouldn’t be, while leaving it armed ignores the potential risk.