Smoke was detected in multiple places on the EgyptAir plane before it crashed, French investigators said. Investigators also said the priority is to find the flight's data recorders of the missing jet. Richard Osman, from Carmarthen, was one of 56 passenger on board.
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.
66 people died in the crash including Richard Osman from Carmarthen.
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.
Richard Osman, a 40-year-old father of two, originally from Carmarthen, Wales, was on board the the Airbus A320 when it crashed in May.
A friend of the British man on the crashed EgyptAir flight, has spoken about the shock of discovering his friend was among the passengers.
The Welsh victim of the EgyptAir crash was a "kind, loving" father-of-two who was "admired by many", his brother has told ITV News.