The search for the recorders is increasingly urgent because their locator beacons have batteries that last about a month and may fail soon.
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meters (14,763 feet) below the surface, which is the deepest the Bluefin can dive.
The latest acoustic data would be analyzed, he said. If confirmed, the signal would further narrow the hunt for the Malaysia Airlines Boeing 777, which vanished March 8 while flying from Kuala Lumpur to Beijing with 239 people aboard. Navy device to detect signal beacons from a plane flight data and cockpit voice recorders, picked up two underwater sounds Tuesday. Two sounds it detected Saturday were determined to be consistent with the pings emitted from the flight recorders, or boxes. searchers are trying to pinpoint the location of the source of the underwater signals so they can send down a robotic submersible to look for wreckage and the flight recorders from the Malaysian jet.
The search coordination center said it was considering options in case a deeper diving sub is needed. or Japan.
Williams said colleagues at the Woods Hole Oceanographic Institution in Massachusetts had autonomous and remotely operated vehicles that dive to 11 kilometers (36,100 feet), although they might not be equipped for such a search.
Houston coordination center said the area to be searched for floating debris on Friday had been narrowed to 46,713 square kilometers (18,036 square miles) of ocean extending from 2,300 kilometers (1,400 miles) northwest of Perth. Up to 15 planes and 13 ships would join Friday search.
PERTH, Australia (AP) An air and sea hunt for the missing Malaysian jet resumed Friday in the same swath of the southern Indian Ocean where an underwater sensor made the fifth detection of a Shoes Nike Cheap signal in recent days, raising hopes that searchers are closing in on what could be a flight recorder.
Spectators take photos of a Chinese Ilyushin IL 76 aircraft as it comes in for a landing at Perth International Airport after returning from the ongoing search operations for missing Malaysia Airlines Flight 370 in Perth, Australia, Thursday, April 10, 2014. With hopes high that search crews are zeroing in on the missing Malaysian jetliner crash site, ships and planes hunting for the aircraft intensified their efforts Thursday after equipment picked up sounds consistent with a plane black box in the deep waters of the Indian Ocean. (AP Photo/Rob Griffith)
not that much of it deeper than 6 1/2 kilometers, he said.
a Malaysian government official said Thursday that investigators have concluded the pilot spoke the last words to air traffic control, night, Malaysian three seven zero, and that his voice had no signs of duress. The conclusion was first reported by CNN.
the surface and transmits its data via radio back to a search plane.
be pretty close to its operating limit. It got a safety margin of error and if they think it warranted, then they push it a little bit, said Stefan Williams, a professor of marine robotics at Sydney University.
Williams said it was unlikely that the wreck had fallen into the narrow Diamantina trench, which is about 5,800 meters (19,000 feet) deep, since sounds emanating from that depth would probably not have been detected by the ping locator.
Another possible signal heard in Flight 370 search
The underwater search zone is currently a 1,300 square kilometer (500 square mile) patch of the ocean floor about the size of the city of Los Angeles and narrowing the area as much as possible is crucial before the submersible is sent to create a sonar map of a potential debris field on the seabed.
Houston has expressed optimism about the sounds detected earlier in the week, saying Wednesday that he was hopeful crews would find the aircraft or what left of it in the future. searching the surface are moving in tighter patterns, now that the zone has been narrowed to about a quarter the size it was a few days ago, Houston said.
Investigators believe the plane went down in the southern Indian Ocean based on a flight path calculated from its contacts with a satellite and analysis of its speed and fuel capacity, but the content of the flight recorders is essential to solving the mystery of why the plane veered so far off course.
The sonar buoys are being dropped by the Australian air force to maximize the sound detectors operating in the search zone. Royal Australian Navy Commodore Peter Leavy said each buoy is dangling a hydrophone listening device about 300 meters (1,000 feet) below Nike Shoes Grey Colour
Complicating matters, however, is the depth of the seabed in the search area. The sounds detected earlier are emanating from 4,500 Nike Shoes Grey And Blue
Once there is no hope left of hearing more sounds, the Bluefin sub will be deployed.
Thursday search of a 57,900 square kilometer (22,300 square mile) area of ocean in a similar location reported no sightings of potential wreckage, the center said.
Underwater vessels rated to 6,500 meters (21,300 feet) could search the seabed of more than 90 percent of the world oceans, Williams said.
The Bluefin 21 submersible takes six times longer to cover the same area as the ping locator being towed by the Ocean Shield and would take six weeks to two months to canvass the current underwater search zone. Navy Capt. Mark Matthews said.
An Australian government briefing document circulated among international agencies involved in the search said the acoustic pingers likely would continue to transmit at decreasing strength for up to 10 more days, depending on conditions.
An Australian air force P 3 Orion, which has been dropping sonar buoys into the water near where four sounds were heard earlier,s picked up a signal on Thursday that may be from a man made source, said Angus Houston, who is coordinating the search for Flight 370 off Australia west coast.
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