( CNN ) -- The search for the data and voice recorders from the Air France plane that crashed more than a month ago off Brazil 's coast is entering a new phase , according to France 's accident investigation agency . Searchers have discovered hundreds of pieces of wreckage from Air France Flight 447 . All 228 people aboard the plane were killed in the June 1 crash . The flight data recorder and the cockpit voice recorder , commonly known as black boxes , stop giving out acoustic broadcasts after 30 days . But investigators decided to continue listening for the `` pings '' for 10 days after that . Now , the two U.S. naval vessels and a French Navy submarine will halt their search for the recorders which investigators hope will shed light on exactly how the plane crashed . The second phase of the search will involve France 's oceanographic ship `` Pourquoi Pas ? '' which carries specialized exploration and intervention vehicles , according to the French air accident investigation agency known as the BEA . The French vessel will conduct new searches using diving equipment and towed sonar , the BEA said . Finding the recorders is of `` capital importance , '' and `` no effort must be spared in achieving this end , '' Air France has said . `` We want to stress that for the sake of the families , we hope that the search for the black boxes will be successful , '' an Air France representative said . This month , investigators revealed that the plane bellyflopped intact into the Atlantic Ocean . Investigator Alain Bouillard said it was still not clear what caused the crash , the deadliest in Air France 's 75-year history . The mountainous ocean floor in the search area ranges from 3,280 to 15,091 feet , BEA officials have said , making the search for the recorders -- and the rest of the plane 's debris -- difficult . `` It is as if it fell in the Andes , '' said Olivier Ferrante , chief of the BEA search mission . Flight 447 went down in stormy weather while flying from Rio de Janeiro , Brazil , to Charles de Gaulle Airport in Paris , France . Brazil called off the search for bodies June 27 , having found 51 of the 228 people who died , according to the military . Investigators have also found more than 600 parts and structural components of the plane , along with luggage , Bouillard said .
Plane went down off Brazil on June 1 , killing all 228 aboard . The cause of the crash was not immediately clear and investigators are still trying to determine what caused it. Investigators planned to keep listening for 10 additional days . French oceanographic ship will conduct new searches .