What does one chime indicate during normal operation?

One chime during normal operation serves as an indication to flight attendants that everything is functioning as expected in the cockpit. It signals that the pilots are communicating a standard message or notifying the cabin crew of normal operational conditions. Flight attendants are trained to recognize this sound and understand that there is no need for immediate action or alarm.

In contrast, other cues such as multiple chimes or specific sequences would indicate a need for flight attendants to address an urgent situation or respond to communication from the flight deck. Hence, the context of the chime plays a critical role in ensuring smooth operations and appropriate responses during a flight.