![]() In order to be easier to find at sea, the devices send out a signal on contact with salt water that can be picked up within a radius of about two kilometers (1.2 miles). Before being put into use, they are tested to see if they can withstand an impact with a concrete wall at 750 kilometers per hour (about 466 miles/hour), a static load of 2.25 tons for at least five minutes, a maximum temperature 1,100 degrees Celsius (2,012 Fahrenheit) for one hour and water pressure found in depths of up to 6,000 meters (about 19,700 feet). According to regulations, however, every airplane must have two of these devices on board.Ī black box must be able to withstand many accident scenarios without sustaining damage. ![]() But today there are also units that can do both. Previously, this data had to be recorded on two different devices. The black box records all relevant flight data, in addition to conversations in the cockpit. "But such evaluations are also for incidents that aren't so spectacular, so-called serious incidents." And by serious incidents, Friedemann means events where a flight narrowly averted disaster.Įssentially, a black box flight recorder is heavily protected recording device, similar to a hard disk or a memory card. "I think we receive something like this every other week or so," said Jens Friedemann, spokesman for the BFU. For specialists at the German Federal Bureau of Aircraft Accident Investigation (BFU) in Braunschweig, evaluating data recorded by a black box is routine.
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