Haunting Clues From Piece of Debris Thought to Be From MH370

French investigators will begin lab work to try and determine what happened in the final moments of the flight.
2:14 | 08/01/15

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Transcript for Haunting Clues From Piece of Debris Thought to Be From MH370
And next to the mysterious airplane part found on a beach in Australia. There's growing certainty it's from mh 370, at this hour, it's packed up and on its way to France. U.s. Investigators and Boeing investigators are going there as well. But the haunting question, was someone trying to make it vanish? And why? Here's Jim Avila. Reporter: Tonight, wing part found on the beach, packed on board a plane to France and Europe's leading center for analyzing aircraft wreckage. While on reunion island, beachcombers search for more evidence by hand. And helicopters like the one bbc reporter Karen Allen flew in today. Searching from the air. Up here you really can appreciate the challenges that investigators face. Reporter: Those investigators now downplaying the likelihood that suitcase came from the missing plane. Focusing on the wing part found by this islander looking for a rock to pound spices. Who only called police after a Google search pointed him to mh370. The part, called a flaperon, helps the plane turn and slow down on approach for landing by pivoting down. The Numbers 657bb found in this Boeing 777 maintenance manual match Numbers found on the barnacle-covered debris. And what does that barely damaged piece of wreckage tell us? It may support early evidence that someone was at the controls, first deliberately turning off course and finally trying to make the plane disappear altogether. If you wanted to minimize the amount of floating debris, the best way to do that would likely be ditch the airplane, land it on the water, intact. Open the doors, let it fill up and sink. Reporter: The French will begin lab work Wednesday looking at all possibilities, including mechanical failure, a crash investigator here tells us they will look where the flaperon detached to see if it separated in the air or when it hit the water. Elizabeth? Jim, thank you. Turning to Cincinnati

This transcript has been automatically generated and may not be 100% accurate.

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