I know that sometimes the simulator does not entirely accurately reflect the way that the aircraft behaves, however at no stage during the many Airspeed Unreliable events I have flown in the simulator, did the Speed Trim System do anything at all that I can remember, and it most certainly did not behave in such a way that presented any problem.
I cant help but think this constant reference to the STS in this thread is due lack of understanding of the STS.
I dont know what caused the airplane in question to end up in the sea, but I highly doubt that the STS caused it.....
The data recorder has been recovered. Give them a few days and some FACTUAL information will be available.