"A flight recorder is an electronic recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents. Flight recorders ...
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are also known by the misnomer black box—they are in fact bright orange to aid in their recovery after accidents.
There are two different flight recorder devices: the flight data recorder (FDR) preserves the recent history of the flight through the recording of dozens of parameters collected several times per second; the cockpit voice recorder (CVR) preserves the recent history of the sounds in the cockpit, including the conversation of the pilots. The two devices may be combined in a single unit. Together, the FDR and CVR objectively document the aircraft´s flight history, which may assist in any later investigation." - (en.wikipedia.org 29.02.2020)