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Playfair · 06-02-2009, 08:31 PM

According to The Guardian http://www.guardian.co.uk/business/feedarticle/8537366

Black boxes have an underwater beacon called a pinger which is activated when the recorder is immersed in water. The beacon can transmit from depths down to 14,000 feet (4,300 metres), according to the U.S. National Transportation Safety Board.

06-02-2009, 08:31 PM	#147
Playfair Scoring Winger Join Date: Aug 2005 Exp:	According to The Guardian http://www.guardian.co.uk/business/feedarticle/8537366 Black boxes have an underwater beacon called a pinger which is activated when the recorder is immersed in water. The beacon can transmit from depths down to 14,000 feet (4,300 metres), according to the U.S. National Transportation Safety Board.