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Air France crash report set for release

A Brazilian navy frigate crew recovers wreckage from the Air France crash in June.
A Brazilian navy frigate crew recovers wreckage from the Air France crash in June.
  • Official: Report has "no surprises" but offers details on safety recommendations
  • New search for data recorders to begin in February, investigation bureau chief says
  • Flight 447 went down in stormy weather in the Atlantic on June 1
  • All 228 people on board were killed

(CNN) -- Investigators probing the June crash of an Air France flight off Brazil will release their second interim report Thursday with a press briefing, officials said.

France's Investigation and Analysis Bureau will hold the briefing Thursday afternoon, the bureau said in a statement.

Flight 447 -- an Airbus A330 -- went down in stormy weather in the Atlantic Ocean on June 1 while flying from Rio de Janeiro, Brazil, to Charles de Gaulle Airport in Paris, France. All 228 people on board were killed.

Large parts of the plane, including both flight data recorders, have never been found, despite an extensive search operation that included a French navy submarine.

Investigators said earlier this week they were planning to resume the search for the data recorders, according to Agence France-Presse. Jean-Paul Troadec, director of the investigation bureau, told reporters that the new search, about 1,000 kilometers (600 miles) off Brazil's northeast coast, will begin in February. The new underwater sweeps will last a maximum three months and involve sonar and robot submarines, he said.

Troadec was in Rio de Janeiro to speak to the relatives of the 58 Brazilians who were on board, AFP reported Sunday. "We tried to convince the families that we are conducting the investigation with the full intention of getting to the truth," he said.

The upcoming report contained "no surprises" but did set out "new details, notably in terms of safety recommendations," he said.

Tests have already brought into question the performance of pitot tubes, which are used to measure the pressure exerted on the plane as it flies through the air, and are part of a system used to determine air speed.

Before it crashed, Flight 447 sent out 24 automated error messages that suggested the plane may have been flying too fast or too slow through the thunderstorms, officials have said.

The European Aviation Safety Agency (EASA) issued a directive in late August requiring airlines to replace pitot tubes manufactured by Thales Avionics on Airbus A330s and A340s. It said airlines should replace them with other Thales tubes and those manufactured by Goodrich.