Aeronautical origin term, which designates the apparatus installed on board the traction vehicle in order to record data and characteristic parameters of the journey (speed, data detected by signaling systems, etc.), in particular in order to reconstruct anomalous events, analysis accidents etc .. Derived from traditional paper recording, the most modern computerized “black box” introduces more recording potential, through a high number of analogical and digital channels, as well as the possibility of transmitting signals via radio in real time to fixed reception stations. More properly, it is called event detector
Link... for your business