Black Box
As a layman I was surprised to read in the Süddeutsche Zeitung, the local Newspaper in Munich, that when a plane goes down on land the Flight Recorder does not send out a signal and they say that that's why it is taking so long to find it. Is this true, and if so what is the reason for this? When a plane goes down in Mountains it seems illogical for the Flight Recorder not to signal it's location in hard to reach terrain.