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The recorders could be lying thousands of feet below the ocean surface.
Without them, it may be impossible to ever know what caused the crash several hundred miles off Brazil's north eastern coast.
1:31pm UK, Monday June 15, 2009
A high-tech US Navy listening device has been deployed to help search the Atlantic for the black boxes of a crashed Air France jet.
The tailfin of the Air France A330 jet unloaded in Brazil
The Towed Pinger Locator will try to detect emergency audio beacons, or pings, from Flight 447's flight recorders.
The Airbus A330 vanished over the Atlantic en route from Brazil to Paris on June 1, killing all 228 people on board in the worst aviation disaster in eight years.
The recorders could be lying thousands of feet below the ocean surface.
Without them, it may be impossible to ever know what caused the crash several hundred miles off Brazil's north eastern coast.
The locator device is capable of searching to a depth of 20,000ft (6,100 metres).
The first of two devices was towed in on Sunday by a Dutch ship contracted by France, said US Air Force Colonel Willie Berges, commander of the American forces supporting the search operation.
Col Berges said the locator device would start operating as soon as searchers were sure it would not interfere with a French nuclear submarine already searching for the black boxes.
Helicopter recovering jet debris
Another Dutch ship carrying a second listening device is scheduled to arrive no later than Monday morning, he said.
The ships will tow the locators in a grid pattern while 10-person teams watch for signals on computer screens.
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The search area includes some of the deepest waters of the Atlantic - and in two more weeks the boxes' signals will begin to fade.