Explainer - How to read an aircraft's black box

FILE PHOTO: Men unload a case containing the black boxes from the crashed Ethiopian Airlines Boeing 737 MAX 8 outside the headquarters of France's BEA air accident investigation agency in Le Bourget, north of Paris, France, March 14, 2019. REUTERS/Philippe Wojazer/File Photo

PARIS (Reuters) - 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.

Here is how the process works.