Search crews hunting for the missing Malaysia Airlines jet zeroed in on a remote stretch of the Indian Ocean on Friday as the starting point for a desperate underwater hunt to find the plane’s black boxes before the battery-powered devices run out.
Two ships with equipment that can hear the black boxes’ pings were slowly making their way along a 240-kilometer (150-mile) route that investigators are hoping may be close to the spot Flight 370 entered the water after it vanished March 8 on a flight from Kuala Lumpur, Malaysia, to Beijing.
But the head of the joint agency coordinating the search acknowledged that the search area was essentially just a best guess _ and noted that time was running out for search crews to find the coveted data recorders, which stop transmitting signals that can be detected by the searchers’ equipment about 30 days after a crash.
“The locater beacon will last about a month before it ceases its transmissions _ so we’re now getting pretty close to the time when it might expire,” Angus Houston said.
The Australian navy ship Ocean Shield, which is dragging a towed pinger locator from the U.S. Navy, and the British navy’s HMS Echo, which has underwater search gear on board, were looking for the black boxes in an area that investigators’ settled on after analyzing hourly satellite pings the aircraft gave off after it disappeared. That information, combined with data on the estimated speed and performance of the aircraft, led them to that specific stretch of ocean, Houston said.
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“The area of highest probability as to where the aircraft might have entered the water is the area where the underwater search will commence,” he said. “It’s on the basis of data that only arrived very recently and it’s the best data that is available.”
Because the U.S. Navy’s pinger locator can pick up black box signals up to a depth of 6,100 meters (20,000 feet), it should be able to hear the devices even if they are lying in the deepest part of the search zone _ about 5,800 meters (19,000 feet) below the surface. But that’s only if the locator gets within range of the black boxes _ a tough task, given the size of the search area and the fact the pinger locator must be dragged slowly through the water at just 1 to 5 knots, or 1 to 6 miles per hour.
Finding floating wreckage is key to narrowing the search area, as officials can then use data on ocean currents to try and backtrack to the spot where the Boeing 777 hit the water _ and where the black boxes may be. The devices would provide crucial information about what condition the plane was flying under and any communications or sounds in the cockpit.