Air France Plane Hit the Water Intact

The list of what is known for sure about the crash of Air France flight 447 grew longer today as France's investigation bureau said the plane was intact when it plunged into the Atlantic Ocean, and there was no trace of fire or explosive found amid the plane's debris.

Those facts were among several announced today when investigators from the Bureau D'Enquetes et D' Analyses, France's equivalent of the National Transportation Safety Board, released its first factual report on the crash.

Watch "World News With Charles Gibson" tonight at 6:30 ET for the full report

VIDEO: New Clues in Flight 447 Crash
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The latest developments include the following:

Investigators were able to determine that the plane was intact when it hit the ocean on its belly after leaving Rio de Janiero May 31 en route to Paris.

"In particular, examination of the tail fin indicates that it did not break up in flight, but upon point of impact," said Alain Bouillard, BEA's head of investigation, speaking today through a translator. "It hit the water in line of flight with a very high vertical acceleration."

None of the plane's life vests were inflated.

No traces of fire or explosives have been detected in the recovered debris. Experts had previously said bodies were not burned, which suggests there was not an explosion.

Faulty speed sensors, called pitot tubes, are not the sole factor that caused the crash. Accident investigators had said that speed sensors malfunctioned on the flight, and the problem could have caused the plane to fly dangerously slow or fast.

Today Bouillard said, "We do not yet have any direct link between the pitot tubes and the cause of the accident."

The investigators did not say what other factors may have contributed to the plane's crash.

"We're far from establishing the causes of the crash" Bouillard said.

Also today, investigators painted a more detailed picture of what the flight crew was up against before the accident. They said the crew tried three times to contact Senegal air traffic control, but were not successful. The Brazilian airport had not given Senegal the flight plan for AF447.

Black Box Hunt Continues

The two most important clues to the mystery -- the flight data recorder and cockpit recorder, known as the plane's black boxes -- have still not been recovered.

The hunt for the black boxes will continue until July 10.

Black box batteries are required to last 30 days, and it's already been more than one month since the flight went down. But investigators are hopeful that their pinging signals have not yet faded entirely, and search teams are racing against the clock to find the flight's most vital clues. The company that makes the black boxes said they could emit pinging sounds a little bit longer than 30 days, but will eventually fade out.

Even this late in the game, the search for the black boxes is not a lost cause. Cutting edge technology could help searchers hone in on the specific underwater spot where clues might lie.

John Springer, sales manager for Dukane Corp. Seacom Division, the company that manufactured the flight's black boxes, said the search equipment can sift through noises in the ocean because it knows what to look for -- much as party guests can do at a loud gathering if they know the sound of a friend's voice.

"By knowing exactly what they're saying or what the person's saying, you can get closer to that person and you can hear them and you eliminate all the sound in the back," he explained.

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