Search teams have retrieved the cockpit voice and flight data recorders from the EgyptAir plane which crashed into the Mediterranean in May, killing all 66 on board.
It is hoped analysis of the black boxes will shed light on why the plane crashed en route from Paris to Alexandria.
At present no militant group has claimed responsibility for bringing down the aircraft.
The doomed EgyptAir plane that crashed last week did not show technical problems prior to take off in Paris, Egyptian investigation sources said on Tuesday.
Egypt's state-owned newspaper Al-Ahram reported that the aircraft showed no technical difficulties before taking off, citing an Aircraft Technical Log signed by its pilot.
Al-Ahram published a scan of the technical log on its website.
The paper said EgyptAir flight transmitted 11 "electronic messages" on May 18 about three-and-a-half hours before disappearing from radar screens with 66 passengers and crew on board.
The first two messages indicated the engines were functional.
At 00.26GMT on May 19, the third message appeared and showed a rise in the temperature of the co-pilot's window.
The plane kept transmitting messages for the next three minutes before vanishing, Al-Ahram said.
Work has begun on analysing data from the two black boxes from the fated EgyptAir flight that crashed into the sea in May.
French air accident investigators confirm the signal detected earlier is from a flight recorder.
The head of Egypt's forensics authority said it is 'too early' to know what caused the EgyptAir plane to crash into the Mediterranean sea.