What color is the call light on the MC Exit Sign when the FA Call Button is pressed?

When the FA Call Button is pressed, the call light on the MC Exit Sign illuminates in blue. This color is specifically designated to indicate that the flight attendant call button has been activated, allowing crew members to quickly identify and respond to passenger requests. The use of blue for this purpose helps ensure that the call is distinguishable from other indicator lights within the aircraft, which may use different colors for other functions, thus enhancing the efficiency of crew responses to passenger needs.