Satellite and other data has allowed investigators to narrow their search to an arc of the remote southern Indian Ocean west of Australia, with ships scouring more than 50,000 square kilometres of deep ocean floor without success.
Mr Truss said if the wreckage was confirmed to be from MH370, it would eliminate some of the “rather fanciful theories” about what happened to the plane.
“It [if proven] establishes really beyond any doubt that the aircraft is resting in the Indian Ocean and not secretly parked in some hidden place on the land in another part of the world,” he said.
“From the part number, it is confirmed that it is from a Boeing 777 aircraft. This information is from MAS (Malaysia Airlines). They have informed me,” deputy transport minister Abdul Aziz Kaprawi said.
The wing component found on the small French island of La Reunion, east of Madagascar, bears the part number 657 BB, according to photos of the debris.
The two-metre-long piece of wreckage, known as a flaperon, was found by people cleaning up a beach on La Reunion on Wednesday.