I appreciate the translation problems. But, if the plane ''landed on its belly'', can we think that the crew made an effort to land upon the water (ditch)?
could the plane have stalled, lost a massive amount of altitude and had its engines quit, recovery at the last second (albeit with a high rate of descent...vertical acceleration) and the crew tried for a landing?
I think we will never really know what happened without the CVR/FDR.
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also wondering if the plane was spinning at time of impact...could plane have come down in a flat spin?