What kind of light illuminates at each PSU when the FA Call Button is pressed?

When the Flight Attendant (FA) Call Button is pressed, a green light illuminates at each Passenger Service Unit (PSU). This green light serves as a visual indicator that a passenger is requesting assistance from the flight attendants. The design of the light system is intentional, as green typically symbolizes a non-emergency situation and indicates for the crew to respond to the request.

The choice of green helps to distinguish passenger calls from other types of alerts on the aircraft. Each color in the PSU lighting is strategically implemented to convey specific information to crew members at a glance. Such a system allows flight attendants to prioritize responses, ensuring safety and service are effectively managed during a flight.