The memory chips of EgyptAir 804's black box voice recorder are intact and investigators should be able to access it, a committee probing the plane disaster said on Saturday.
The other black box, a data recorder that had also been retrieved from the bottom of the Mediterranean after the aircraft plunged into the sea, has already been accessed.
It had confirmed that smoke alarms had sounded in the Airbus A320 before it went down on May 19, while flying from Paris to Cairo with 66 people on board.
The voice recorder is being repaired at the French accident investigation agency.
"None of the memory chips of the electronic board was damaged," the Egyptian-led probe said in a statement.