Do you still remember Tragedy of Air France Flight 477 at June 1 2009? This Air France 447, flying from Rio de Jenerio , Brazil to Paris, France disappears with 228 passengers. At June 7, 17 bodies have been recovered from the crash. The bodies are found 700 miles from the Brazilian coast, in the same are where pieces were found Saturday June 6.
Until now, we don't know why this Air France crash and disappears. We hope that Black Box could hold answer to plane crash mystery. Here is summary an article from CNN about Black Box of Air France Flight 447.
The "black box" is actually an orange cylinder -- about 13 pounds of metal wrapped around a stack of memory chips and designed to withstand the force of being slammed high-speed into a brick wall.
One such device -- possibly sitting more than two miles below the surface of the Atlantic Ocean -- is the object of a massive international search and could hold the answer to why Air France Flight 447 mysteriously crashed into the sea off the coast of Brazil last week with 228 people on board.
"These record many, many parameters of the flight -- the aircraft, its altitude, even the amount of force that one of the pilots might put on a pedal," John Perry Fish, an underwater recovery expert, told CNN. "It's very important to find these in order to find out what happened to the flight."
In the wake of nearly every air disaster, search and rescue efforts immediately segue into quests for the boxes, which have been in wide use on commercial flights since shortly after World War II.
In fact, a number of devices -- the flight data recorder and a voice and audio recorder -- the equipment records virtually everything about how an airplane is working.
The time of day, air pressure, the plane's speed and altitude, how much fuel a plane has and whether that fuel is flowing properly -- all are recorded by sensors throughout the plane. Functions that can change quickly, such as the position of rudders and flight stabilizers, are checked as often as eight times per second, said Chris Benich, director of aerospace regulatory affairs with Honeywell, the company that made the recorders aboard the Air France flight.
In January 2007, a Boeing 737 crashed into about 5,600 feet of water off the coast of Indonesia. Recovery crews located the black box about 25 days later but weren't able to retrieve it for about eight months. The data were still intact when it was found.
"I think this will be as challenging a recovery as we've seen," Benich said of the Air France search. "But as long as we know where they're at, we've got some time to go get them."

Read full arcticle at CNN

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