Originally Posted by Sticky
Well if there was a collision of some sort whether land or water the ELT had to go off. But the ELT doesn't work underwater so I suppose if it did hit the water hard/fast enough it wouldn't have time to communicate. The other possible scenario is a sudden explosion of the aircraft, destroying the ELT, which I doubt happened. So it either landed or went underwater really fast where it couldn't communicate.
ELT can't be disabled from the cockpit at all. The black box can't either.
The pinging was coming from the engine computers so if the engines are off there should be no pings. I think there's a lot more to the story they aren't telling us. "