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More pings raise hopes in MH370 search

09 April 2014, 07:45

Perth - A ship searching for the missing Malaysian jet has detected two more underwater signals, raising hopes the wreckage of the plane will soon be found, the Australian official in charge of the search said on Wednesday.

Angus Houston, the head of a joint agency co-ordinating the search for the missing plane in the southern Indian Ocean, said that the Australian navy's Ocean Shield picked up the two signals in a sweep on Tuesday, and that analysis of two sounds detected in the same area last week showed they were consistent with a plane's black boxes.

"I'm now optimistic that we will find the aircraft, or what is left of the aircraft, in the not too distant future - but we haven't found it yet, because this is a very challenging business," Houston said at a news conference in Perth, the hub for the search operation.

The Ocean Shield first detected underwater sounds on Saturday before losing them, but managed to pick up signals again on Tuesday, Houston said. The ship is equipped with a US Navy towed pinger locator that is designed to detect signals from a plane's two black boxes - the flight data recorder and cockpit voice recorder.

An analysis of the signals detected on Saturday determined they were stable, distinct and clear sounds that pulsed consistently - indicating they were coming from a plane's black box, Houston said.

"[The analysts] therefore assess that the transmission was not of natural origin and was likely sourced from specific electronic equipment," Houston said. "They believe the signals to be consistent with the specification and description of a flight data recorder."

Battery life

Despite the promising evidence, Houston warned that he could not yet definitely say searchers had pinpointed Flight 370's crash site.

"I think that we're looking in the right area, but I'm not prepared to say - to confirm - anything until such time as somebody lays eyes on the wreckage," he said.

Finding the black boxes quickly is a matter of urgency, because their locator beacons have a battery life of only about a month - and Tuesday marked exactly one month since the plane vanished.

Once the beacons blink off, locating the black boxes in such deep water would be an immensely difficult, if not impossible, task.

Houston acknowledged that they were running out of time, and noted that the signals picked up on Tuesday were weaker and briefer than the ones heard over the weekend. The two signals picked up on Saturday lasted two hours and 20 minutes and 13 minutes, respectively; the sounds heard on Tuesday lasted just 5 and a half minutes and 7 minutes.

"So we need to, as we say in Australia, 'make hay while the sun shines,'" Houston said.

Picking up the sound again is crucial to narrowing the search area so a small submarine can be deployed to chart a potential debris field on the seafloor, which is about 4 500m deep.

If the autonomous sub was used now with the sparse data collected so far, covering all the potential places from which the pings might have come would take days, if not weeks. It takes the sub six times longer to cover the same area than it does the towed pinger, Houston said.

"The better Ocean Shield can define the area, the easier it will be for the autonomous underwater vehicle to subsequently search for aircraft wreckage," Houston said.

Layers of silt

Houston said a decision had not yet been made on how long searchers would to wait after the final sound was heard before the sub was deployed, saying only that time was "not far away". He smiled but did not reply when asked if the sub would be deployed on Wednesday.

"Hopefully in a matter of days, we will be able to find something on the bottom that might confirm that this is the last resting place of MH370," he said.

Malaysia Airlines Flight 370 vanished on 8 March on a trip from Kuala Lumpur, Malaysia, to Beijing with 239 people on board, sparking one of aviation's biggest mysteries.

The search has shifted from waters off of Vietnam, to the Strait of Malacca and then finally to waters in the southern Indian Ocean as data from radar and satellites was further analysed.

But finding any wreckage in such deep water has proved to be a monumental task. In addition to the depth and remoteness of the area, search crews are also contending with layers of silt on the sea floor that can both hide any possible wreckage and distort the sounds emanating from the black boxes that may be resting there, said Royal Australian Navy commodore Peter Leavy, who is helping to lead the search.

Meanwhile, the search for debris on the ocean surface picked up intensity on Wednesday, with 15 planes and 14 ships scouring a 75 427 square kilometre area that extends from 2 261km northwest of Perth.

- AP


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