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This is the data plate. every part would have a data plate identifying part number and serial number that tells you this is this type of component. >> reporter: as we see in the debris that washed up on reunion island there's nothing here. what are investigators having to go off now to tie this mac to mh370. >> investigators using footage like this and tieing it to drawings components schematics. in this case the part itself to see is it the same component that we think we have found over there? >> reporter: you have been following this since last year. there's a lot of interest in your field ...

What is it? >> that piece right there. >> reporter: that 6 1/2 foot piece? >> that's right. it combines the aleron and flaps themselves. >> reporter: so it controls the landing? >> yes. it extends away from the aircraft and gives pilot more control over the aircraft at takeoff and landing. >> we have one in front of us to give us detail of what the investigators at reunion island are working with. how would they be able to tie this specific flaperon back to the one on the plane that is missing? >> the data point will list the part number and serial number of the unit. >> but we saw from these ...

Identify it by a data plate. >> reporter: on the image you're showing here this is the debris here and it seems to be missing from that portion. is that right? >> yeah. we have a foet teaphoto here and the data plate is gone. >> reporter: what about the damage? tell us what that could signify. what does that mean? there's a lot of theories. the damage that you're noticing on this flaperon what does that tell you? >> again, back to the picture, if you look at the damage here in the left-hand corner as well in the back of the component, on a clean component, there's a lot of hinges tied to it. t...

Across the team a new burst of energy. >> french investigators are working to identify this beespiece, and then to begin the process of looking at the flow charts to see if they can backtrack and find the rest of the plane. they'll also look at the sea life on the wreckage to see if that provides clues as to the journey the piece might have taken. >> tom, thank you very much. i want to bring in aviation attorney daniel rosen, former ntsb greg fife. thank you both for being with me. greg let's start with you. talk to me about the forensics. what are investigators looking for? >> one of things j...

In austin, texas. gret feith joins me. an faa spokesman said there was so much damage to the wreckage of the plane, it was hard to identify. how do ntsb investigators go in and attribute to this investigation of how this crash went down. >> one of the first things they will do is examine the accident site itself, look at the wreckage. there are some signs on the airplane, a data plate. they can confirm the aircraft serial number, run it against records. they will look at the airplane to see how it impacted. it's very obvious it hit this building at a very high rate of speed. at least that's wh...