Lebanese navy divers located the box on Saturday
Lebanese search teams have retrieved the flight recorders from the Ethiopian Airlines jet that crashed in the Mediterranean, army sources say.
The Boeing 737 crashed on 25 January, moments after take-off from Beirut airport during a fierce thunderstorm, killing all 90 people on board.
A senior army official told the media the flight recorders were removed and taken to a naval base in Beirut.
The unnamed official was not authorised to speak publicly to the media.
Lebanon's Transport Minister, Ghazi Aridi, announced on Saturday that searchers had located the two boxes, and that army divers had gone down to retrieve them.
Searchers also retrieved the plane's rear wings and the cockpit in the last 24 hours, the Reuters news agency reports.
The cause of the crash is not yet known, however Lebanese officials have said the jet did not fly in the direction instructed by the Beirut control tower.
The flight data recorders - the so-called black boxes - could contain data explaining the circumstances of the crash.
Seven crew and 83 passengers were on board the Boeing 737-800. Most were Lebanese or Ethiopian.
At least 15 bodies have been recovered since the crash, but stormy weather has hampered searchers several times in the last two weeks.