There is no 100% proof of what actually occurred
There usually isn't unless there's a running video camera. But I would say the investigators provided a pretty sound estimate.
No, I agree. The investigation team did a thorough job . The point I meant to make is that no one will never know exactly what caused the crash in the absence of any technology that small aircraft do not carry and that could of aided the investigation.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock