Tags: missing | jet | likely | found | in | days | pings

Missing Jet Search Chief: New Pings Heard, Plane Likely Will Be Found in a 'Matter of Days'

Image: Missing Jet Search Chief: New Pings Heard, Plane Likely Will Be Found in a 'Matter of Days'

Wednesday, 09 Apr 2014 06:48 AM

 

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Australian officials said on Wednesday two new "ping" signals had been detected in the search for Malaysia Airlines Flight MH370, boosting confidence after more than a month of fruitless searching for the missing jetliner.

The signals, which could be from the plane's black box recorders, bring to four the number of overall "pings" detected in recent days within the search area by a U.S. Navy "Towed Pinger Locator"(TPL).

Angus Houston, head of the Australian agency coordinating the search, struck an optimistic tone when announcing the information, but urged caution as the task of searching the remote Indian Ocean region remained enormous.

"I believe we are searching in the right area'' for the wreckage, he said, adding that the sounds were definitely not of "natural origin."

"In a matter of days we will be able to find something on the bottom that might confirm that this was the last resting place of MH370," he said. "I'm now optimistic that we will find the aircraft, or what is left of the aircraft, in the not too distant future."

The black boxes record cockpit data and may provide answers about what happened to the plane, which was carrying 227 passengers and 12 crew when it vanished on March 8 and flew thousands of kilometers off its Kuala Lumpur-to-Beijing route.

But the batteries in the beacons have already reached the end of their 30-day expected life, making efforts to swiftly locate them all the more critical.

Authorities say evidence suggests the plane was deliberately diverted by someone familiar with the aircraft, but have not ruled out mechanical problems.

Analysis of satellite data led investigators to conclude the Boeing 777 came down in a remote area of the Indian Ocean, some 2,261 km (1,405 miles) northwest of Perth. 

FRESH PINGS BUT IN A LARGE AREA

Up to 11 military aircraft, four civilian aircraft and 14 ships were involved on with a massive search that has yielded frustratingly little concrete information.

On the weekend, the sophisticated U.S. Navy TPL picked up what officials said were two signals consistent with black box locator beacons - the first for more than two hours and the second for about 13 minutes.

On Wednesday, Houston said that another ping was detected on Tuesday afternoon and lasted five minutes, 25 seconds, while a second was picked up on Tuesday night and lasted seven minutes. That brings to four the number of pings found in the area.

But two U.S. Navy officers told Reuters on Wednesday that while the pings had been found within a 1,300 square kilometer area, they were not confident that they represented recurrence of the same signal.

"I'd say they are separate acoustic events," said U.S. Navy Captain Mark Matthews, citing the fact that the pings were not close together.

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"There has been variability in the geographic position which leads me to be less optimistic than I would be if I could consistently reacquire the signal so that I have a nice, small geographic area to focus the autonomous under water vehicle search on," he added.

The process of teasing out those signals from the cacophony of background noise in the sea is a slow and exhausting process, experts say.

Operators must separate a ping lasting just 9.3 milliseconds - a tenth of the blink of a human eye - and repeated every 1.08 seconds from natural ocean sounds, as well as disturbances from search vessels.

"The ocean is a noisy place," said Mike Davis-Marks, former commander of a sister vessel to British hunter-killer submarine HMS Tireless which has been dispatched to assist in the search.

"There is noise from everything, whether it's the ambient noise of the weather at the surface, or marine life like whales or the snapping noise of shrimps, not to mention other sea transport and low-flying aircraft."

A RACE AGAINST TIME

Although the batteries in the black box recorders are thought to have a lifespan of roughly 30 days, officials have said they can last for as long as two weeks beyond that time.

That meant the search was becoming even more of a race against time, said Houston.

"I mean, we are looking at this stage for transmissions that are probably weaker than they would have been early on because the batteries of both devices are passed their use-by date and they will very shortly fail," he said.

An autonomous underwater vehicle named Bluefin-21 is onboard the Australian navy vessel the Ocean Shield, which is helping in the search, and it could be sent to look for wreckage on the sea floor once the search area is narrowed down.

The search could be conducted at a depth of about 4.5 km (2.8 miles), the outer reach of the Bluefin's range.

Further complicating matters, Houston said, is that the ocean floor there is believed to be covered in a thick layer of silt that could further obscure what is already expected to eventually be a technically challenging visual search.

Despite the new signals, Houston insisted that search teams should exhaust the capability of planes and vessels before deploying underwater vehicles.

"Bear in mind, that the time spent on the surface we're covering six times more area and any given time than we'll be able to do when we go underwater," Houston said.

"So with the batteries likely to fade or fail very shortly, we need to get as much positional data as we can so that we can define a very small search area."

Special: Can Natural Statins Replace Cholesterol-Lowering Drug?

© 2014 Thomson/Reuters. All rights reserved.

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