Electrical devices for use in cabin intercommunication data systems on board aircraft, namely, loudspeakers, microphones, amplifiers, audio players and video players for cabin interphone, service and flight crew interphone, passenger addressing, playing and making announcements, playing boarding and passenger entertainment music, and playing passenger entertainment and informational video, illuminatable signs and signals for passenger direction and information and emergency evacuation signalling, lavatory smoke detectors, passenger call lights, emergency and standby power supply units, door monitors, escape slide gas bottle pressure monitors, water freeze protection heaters and monitors, potable water indicators and selectors, waste water indicators, air temperature thermostats for air conditioning control and monitoring, LED, LCD and video terminal visual displays, PC-power supplies, PC-power cables, PC-power connectors, telefax transmitting and receiving devices and component parts therefor, aircraft network communication cables, connectors and controllers, and cabin data servers, all sold together as a unit, and replacement parts therefor; electrical controllers; electrical cables, electrical conductors, and parts therefor; electrical switches, electrical distribution panels, and electrical distribution cabinets, and parts therefor; computers and component parts therefor; computer programs recorded on data carriers for use in cabin intercommunication data systems on board aircraft, namely, software used to monitor, control, test, indicate the operating status of, and reconfigure the operating arrangement of all of the above identified goods