It is very sad for the crew, the last part of that ride was terrifying!
The ADS-B track can be found here:
https://globe.adsbexchange.com/?icao...amp=1668795559
I note, with alarm, a "groundspeed" of 176 kts (one knot faster than Vmo), and a rate of descent of 9408 FPM as the last report. Also noteworthy is the apparent increase from just faster than 50 knots, to more than 175 in just a few seconds, as seen on the Youtube video report. I know that when I did a spin test program on a modified Grand Caravan, I calculated a momentary peak rate of descent of 9600 FPM,
at Vmo,
and a 2.5G pull to recover the dive resulting from the spin recovery. I installed a G meter for the testing, as spinning was required for a demonstration of design compliance, and I anticipated getting into the corner of the envelope, and wanting to know just where I was there. I have dive tested several Caravans to 193 KIAS, and they are a smooth as glass, but I sure avoided rough air, and rough handling! I will await the results of the NTSB investigation with great interest!