When a passenger is in the laboratory and needs assistance, what will you hear in the cabin?

When a passenger requires assistance in the laboratory, a single HI chime is heard in the cabin. This auditory signal is specifically designed to alert the cabin crew that a passenger needs help in the restroom area. The single HI chime differentiates it from other notifications that may indicate different levels of urgency or situations on the aircraft.

This operational procedure is standardized to ensure quick recognition of the need for assistance, allowing for a timely response from flight attendants. Understanding these signals is crucial for safety and customer service, as it helps maintain an organized response to passenger needs.