What should No3 do upon hearing "No 1 to the flight deck" while seated?

When No3 hears the announcement "No 1 to the flight deck," it is essential for them to promptly respond on the intercom by communicating "cabin to the flight deck." This action signals their awareness of the call and indicates that they are ready to assist in any capacity needed in the flight deck area.

This prompt response helps maintain effective communication between cabin crew members and the flight deck, ensuring that any urgent matters can be addressed quickly. It's crucial for maintaining the operational flow of the flight, particularly in scenarios where immediate attention may be required by the flight crew.

The other choices do not prioritize timely communication or may lead to delays in critical situations. Waiting for further instructions does not convey readiness and could potentially hinder operations. Assisting passengers, though an important part of their role, can distract from the immediate need to respond to the flight deck. Heading to the exit is not appropriate, as it would not relate to the required protocol in responding to an announcement directed to cabin crew.