What is the first action when operating the oxygen bottle?

When operating the oxygen bottle, the first action of informing the flight deck is crucial because it ensures that the captain and other flight crew are aware of the situation involving the oxygen supply. This communication is essential for coordinating the overall response and ensuring that emergency procedures are followed safely and effectively. The flight deck needs to be notified of any issues with the oxygen system as it may impact flight operations and passenger safety.

Engaging with the crew in such situations can also facilitate additional support or resources, such as preparing for a potential descent or ensuring that the cabin crew are ready to assist passengers. This helps in following established protocols for managing in-flight emergencies with the correct level of coordination and information sharing among the crew.