When the FA call button is depressed, which light indicates this at each PSU?

When the flight attendant (FA) call button is pressed, the green light at each passenger service unit (PSU) is illuminated to indicate that a passenger has initiated a call for assistance. This green light serves as a clear signal to the flight attendants that a passenger requires their attention, enabling them to respond promptly.

In the context of aircraft operations, having a recognizable and distinct signal helps maintain an efficient and effective communication system between passengers and cabin crew. The illumination of the green light specifically offers a visual cue that is easily identifiable in the cabin environment, thus ensuring that flight attendants can quickly ascertain areas where their presence is needed.

This clear signaling system contributes to cabin safety and enhances the overall passenger experience by ensuring that requests for assistance are promptly addressed.