Quote:
Originally Posted by Hot_Flatus
All these large commercial planes are equipped with devices to send signals but generally only after a disturbance. IIRC the transmitter needs to be activated by a high G force to start working. The black box can only be heard if sonar equipment is deployed - something I don't believe will be done until they are certain its in the water.
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You are discussing two different things, you are talking about what will set of the ELT. KelVarnsen is talking about the datalink option allowing the aircraft to send system messages/failures through the ACARS system to the company dispatch (which is what happened with AF 447).