When should the announcement regarding the arm door be made?

The announcement regarding the arm door should be made after the door is closed and before arming the door. This timing is crucial as it ensures that all necessary safety protocols are followed before proceeding with the arming process. Making the announcement at this stage allows crew members to confirm the door's secure closure and to prepare passengers for the next steps in safety procedures.

Additionally, this sequence helps in maintaining clear communication among the flight crew, ensuring that everyone is aware of the status of the door before it is armed. It enhances safety by preventing any potential issues that could arise if the door were armed while still in motion or not fully secured. The protocol emphasizes the importance of securing the aircraft before arming the doors, as arming indicates that the aircraft is ready for takeoff and that safety precautions must be adhered to diligently.