Originally Posted by
compressor stall
That video footage certainly has the hallmarks of a Vmca incident, with such a sudden flip, if so then it's nothing like the Essendon incident referred to above.
It might be the camera angle / distortion but from the dash cam near the hangar, just before it snaps inverted it appears to be flying well out of balance....crabbing well sideways.
Very sad.
Maybe the autofeather was inop? Hard to believe because on every PT 6 I've flown that was a no-go item.