What is indicated by a high low chime amber light?

A high low chime amber light is specifically used to indicate that a customer is calling for assistance from the lavatory. This alert is designed to notify flight attendants that someone inside the lavatory requires help, which may include anything from needing assistance with facilities to a passenger feeling unwell. This system is crucial for ensuring timely responses to passenger needs and maintaining safety and comfort on board.

Understanding the function of this signal is essential for flight attendants as it keeps the communication lines open with passengers, ensuring that any requests for help are addressed swiftly, and passengers feel cared for during their flight. The other options represent different situations that warrant attention but do not specifically relate to the high low chime amber signal.