The condition of new wreckage, which authorities believe is almost certain to have come from Malaysian Airlines Flight MH 370, shows the plane would have hit the water at high speed and disintegrated on impact.
The find by a South African family in Mozambique - possibly the most significant discovery of wreckage from MH370 so far - would dispel the theories that the pilot tried to make a controlled landing.
A serial number on the wreckage - dubbed the fourth piece - matches an upper main wing panel and shows it is almost certainly from MH370 say experts.
A South African family that recently were on holiday in Mozambique came across the piece in December but only realised the significance after another suspected piece of debris - the second - was found on a sandbank off Mozambique two weeks ago.
The new fourth piece bears a striking resemblance to the second found by American MH370 hunter Blaine Gibson.
The family are now in contact with South African and Australian authorities.
South Africa’s Civil Aviation Authority's Accident and Incident Investigations Division has confirmed to East Coast Radio Newswatch they are sending an official to pick up the debris, before passing it on to international investigators looking into the disappearance of the plane.
AirlineRatings understands its will be flown to Australia for identification.
The second piece found by Mr Gibson arrived in Malaysia yesterday and is being sent onto Australia over the weekend for examination.
Another piece - the third - which carries the grey and blue Malaysia Airlines colours was discovered on Reunion Island last week.
In a twist, that piece which was now been handed over to police, was found by the Johnny Begue, who discovered the first piece of debris - a "flaperon" off MH370 in July last year.
Mr Begue told AFP that he was out jogging on the shore when he found the object measuring about 40 by 20 centimetres which had a blue mark on the surface and was grey underneath.
This piece is being flown to France for examination.
Last week UWA oceanographer Charitha Pattiaratchi said drift modelling showed that debris would wash up first at Reunion Island then the East Coast of Africa
Professor Pattiaratchi said that “debris would start appearing in the Mozambique Channel from September last year.”
The latests finds, if confirmed from MH370, confirm with out any doubt that the international search team are looking in the right area, 1800km west-south-west of Perth, for MH370 according to Professor Pattiaratchi.
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