What color is the light that indicates the FA call button has been activated?

The light that indicates the flight attendant call button has been activated is green. This color is universally recognized in the aviation industry to signal that immediate attention is requested from flight attendants. When passengers activate the call button, the corresponding light illuminates to alert the flight attendants to the specific seat location requiring their assistance. This system ensures efficient and prompt service during the flight, enhancing passenger safety and comfort.

While other colors may serve different functions in an aircraft's signaling system, green is specifically designated for the FA call alert.