How many activated when Air France FL-447 went down?
ELTs are activated either manually or by sudden deceleration with a g-switch. Plus, the life rafts aboard have ELTs in them which are activated when the raft is deployed.
So if it did a belly landing, unlike AF flight 447, at least one would have been activated. With a belly landing that might give the crew to deploy the life raft thus activating the second one.
There was not a distress beacon on AF flight 447 but there was debris found plus signs of oil or jet fuel on the water surface, aircraft seats, an orange buoy, dead bodies, a passenger’s briefcase, and other things.
We haven’t seen any distress beacons nor crash debris.