MH370 Probe: Part Number on Debris from Indian Ocean Consistent With 777, Official Says

Flaperon washed ashore on small French island near Madagascar.

— -- The piece of an airplane that washed ashore on a small French island near Madagascar yesterday appears to come from a 777, Boeing engineers believe, because of a part number in a photo of the wreckage, a U.S. official familiar with the investigation into told ABC News.

Warren Truss called finding the debris, which Malaysia Airlines identified as a flaperon, the first real evidence that a piece of the plane had been discovered.

A tattered suitcase also washed ashore today near where the airplane debris was found, according to a newspaper in Reunion Island. Police seized the suitcase as part of its investigation, reports the paper.

Truss said marine researchers have been asked to examine the photographs of the debris to assess whether barnacles seen on the flaperon are consistent with something that was floating in the ocean for more than a year.

"Clearly, we are treating this as a major lead," he said.

While identifying the debris as part of the missing plane won't make it easier to find, Truss said it would help put some of the theories about the flight to bed.

Truss added that he hoped identifying the debris would bring some closure to the families of those on board the flight.

"If this wreckage [is] from MH370, it's an important breakthrough, particularly for families," he said. "The families who have been involved with this long, long, long, long wait, for them to have some degree of closure would be great comfort."

Malaysian authorities said a team was headed to Reunion Island to determine whether the debris belonged to MH370. The Malaysians were also in touch with the French's air crash investigation agency.

Former NTSB aviation safety official and current ABC News consultant Tom Haueter said investigators would likely try to match serial numbers found on the flaperon with those from MH370.

"If it is a 777 part, it’s most likely from MH370," he said.

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