What is indicated by “No 1 to the flight deck” status during a decompression?

The indication of "No 1 to the flight deck" status during a decompression signifies that the pilots are aware of the situation. This phrase serves as a communication protocol within the flight crew, alerting the cabin crew that the pilots recognize the emergency scenario and are taking necessary actions to manage it.

This status is crucial because the safety and efficiency of the response to a decompression largely depend on the pilots being informed and initiating emergency procedures. When the cabin crew receives this indication, they can be reassured that the flight deck is handling the situation, allowing them to focus on their roles and responsibilities in ensuring passenger safety.

In contrast, the other options do not capture the significance of this specific status. While assistance might be needed or emergency measures could be initiated, the explicit intent of the phrase is to confirm pilot awareness and ongoing management of the emergency rather than directly addressing those other situations.