The flight left Rio on Sunday at 7 p.m. local time. About four hours later, the plane sent an automatic signal indicating electrical problems while going through strong turbulence, Air France said.
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"It's going to take a long time to carry out this search," Douglas Ferreira Machado, head of investigation and accident prevention for Brazil's Civil Aeronautics Agency, or ANAC, told Globo news. "It could be a long, sad story. The black box will be at the bottom of the sea."
Air France-KLM CEO Pierre-Henri Gourgeon, at a news conference in Paris, said the pilot had 11,000 hours of flying experience, including 1,700 hours flying this aircraft. No name was released.
Aviation experts said it was clear the plane was not in the air any longer, due to the amount of fuel it would have been carrying.
"The conclusion to be drawn is that something catastrophic happened on board that has caused this airplane to ditch in a controlled or an uncontrolled fashion," Jane's Aviation analyst Chris Yates told The Associated Press.
"I would suggest that potentially it went down very quickly and so quickly that the pilot on board didn't have a chance to make that emergency call," Yates said, adding that the possibilities ranged from mechanical failure to terrorism.
Airbus declined to comment until more details emerge.
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