This the noise that comes from an aircraft’s black box following a crash at sea. Reuters explains how the recording device works
PARIS - France’s BEA safety investigators are searching for clues as to what caused an Ethiopian Airlines plane to hurtle to the ground after take-off, as they begin analysing two black boxes that arrived in Paris on Thursday from the crashed Boeing 737 MAX.
There are two recorders: a Cockpit Voice Recorder for pilot voices or cockpit sounds and a Flight Data Recorder . Investigators sometimes use “spectral analysis” - a way of examining sounds that allows scientists to pick out barely audible alarms or the first fleeting crack of an explosion.The L-3 data chip on a similar Lion Air jet that crashed in October contained 1,790 parameters over 19 flights.“The data recorder typically tells you ‘what’ and ‘how’ the event happened and the cockpit recorder starts to help you understand ‘why’ but may not be enough,” said an investigator.
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