The accident occurred in Brazil just a few years back. It's been a while so I can't remember all the details. I believe just the two pilots were onboard. The accident was pilot error, though. The pilots were doing 260 knots with the props at MAX (100% Np). They were basically using the props as speed brakes which is a big "no no" in the Brasilia (at least we taught that at Skywest). The limitation on the condition levers at MAX was 200 KIAS. I forget the specifics, but this high speed placed a massive amount of stress on the PCU's. As the airspeed decreased, the load changed on the prop and caused it to go into BETA. This caused the overspeed. An overspeed in the Brasilia is recoverable, but you have to correct very quickly. The trick is to get slowed with flaps and use the manual feather and the electric feather switch to drive the prop towards feather. When I worked at Skywest, this was a memory item. Hopefully, I got the details of the accident cause correct. Maybe somebody else could correct me if I'm wrong.