When an aircraft gets involved in an accident and everything is destroyed but yet authorities are able to tell exactly what caused the accident. Are these authorities witches and wizards? No they are not, it a simple mechanism or device that does the trick known as the Black Box.
Black box is a recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents. It is normally painted bright orange in color to make it easier in their recovery after accidents.
A Black Box is able to withstand many accident scenarios without sustaining damage. 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).
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). At such a short range, the location of the wreck should already be more or less pinpointed in order to find the device.
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