There are a couple of hints in the second report.
The last recorded level was FL251 Although its cruising level was reported as FL260.
That could indicate the aircraft was climbing to its cruise level?
In such a situation especially with VS selected and the pilot preoccupied its possible the aircraft stalled.
As stated the stall is bad hence why certain "extras" were required.
I believe? and I dont know a lot about the aircraft that it will flat spin?
One witness reported seeing the aircraft flat spinning!
That is not in itself a high load state enough to break off a wing so surely that must have lead to some recovery manouvre which was a high load?
There are too many possibilities which lead to this very tragic accident and displaying the pictures of such a happy family unit brings it harder to home of what a cruel mistress aviation can be!
Huck: my experiences with Hypoxia in training chambers showed me that at 25 K, it takes about a minute or so to get loopy, for some, and up to three minutes for others. Point? He could have been one of those who goes loopy faster if decompression was what happened.
At 25K I wonder how anyone managed to climb Everest without oxygen if they would only last 1 to 3 minutes?
he plane, a 2006 Pilatus PC-12/47, was at an estimated altitude of 21,500 feet when it began having problems, said Tim Monville, a senior air safety investigator in Miami with the National Transportation Safety BoardT
Just missed this bit above
Pace