."ELT . . . ON" to the QRH
I mentioned this several hundred posts ago. I would certainly switch on if I was in any sort of emergency descent, depress, etc. It is just above my head and I have bashed it a few times.
I still maintain that the aircraft is at the bottom of the sea and intact.
No reason for the engines to be 'torn' off as the motors would be turning at initial impact. Most of the energy would have been absorbed by the time the flaps hit the water.