American black box locator en route to Perth (1/2)

The American Towed Pinger Locater, an instrument that can help find a black box, is en route to Perth and will arrive Wednesday. In a statement released Sunday, the U.S. Navy stressed that the deployment of the locator, namely the Towed Pinger Locator 25 (TPL-25), was only a "precautionary measure in case a debris field is located." The TPL-25 system, according to the statement, is able to locate black boxes of downed aircraft "down to a maximum depth of 20,000 feet (6 km) anywhere in the world." [Photo/Xinhua]