Initial attempts to download information from the flight data and voice recorders of an EgyptAir plane that crashed into the Mediterranean last month have failed, and key parts of the recorders are being sent to France for repairs, according to Egyptian and U.S. officials.

The “electronic boards” of the recorders are being flown next week to the offices of the French aviation accident investigation bureau near Paris, authorities said. After the boards are repaired and salt removed, they will be sent back to Cairo for data analysis, Egypt’s Investigation committee said in a statement late Thursday.

The recorders, also known as black boxes, were extensively damaged when EgyptAir Flight 804 traveling from Paris to Cairo plunged into the sea on May 19, killing all 66 people on board.

French and U.S. investigators have overseen the effort to extract information from the recorders. The recorders were made by Honeywell, a U.S. company. The plane, an A320, is made by Airbus, which is based in France.... Read More: YWN