Aircraft Detects Possible Signal From MH370

A signal thought to come from one of the black boxes of the missing Malaysian plane has been picked up by an aircraft.

The search agency coordinating the search for Flight MH370 said on Thursday an Australian navy P-3 Orion aircraft had detected a sound in the same area 'pings' were heard on Saturday.

It brings to five the number of possible signals that have been detected so far.

Associated Press said the aircraft had dropped sound-locating buoys by parachute into an area near where the 'pings' were first heard.

A map showing the two areas being currently searched

On Saturday a ship picked up signals consistent with those emitted by a black box, known as 'pings', and again on Tuesday, allowing searchers to narrow down their search area.

Angus Houston, who is heading up the search, said in a statement that the plane had picked up a "possible signal" that may be from a man-made source.

He added: "The acoustic data will require further analysis overnight."

The first four 'pings' were heard in the smaller area being searched

The Australian naval ship ADV Ocean Shield, which picked up the first four 'pings', has been joined in the area by Britain's HMS Echo and the Chinese ship Haixun 01.

They are searching an area of the southern Indian Ocean 1,670km (1,040 miles) from Perth after the plane went missing on route from Kuala Lumpur to Beijing on March 8.

The Australian navy has been dropping buoys in a pattern across the area where Ocean Shield heard 'pings'. It is referred to on maps as the 'sonobuoy' area.

Search aircraft, like the Orion, undertook at least 30 flights on Thursday

Royal Australian Navy Commodore Peter Leavy said attached to each is a hydrophone listening device which dangles about 300 metres (1,000ft) below the surface.

He said the hope was that the buoys would be able to pinpoint the source of the signals.

Meanwhile, the Australian authority tasked with coordinating the hunt for the missing plane has narrowed the overall search area to 22,000-square-miles.

ADV Ocean Shield is towing a 'pinger locator'

Ten military aircraft, four civil planes and 13 ships have joined the search effort a day after two further signals were detected in the southern Indian Ocean.

The Joint Agency Coordination Centre (JACC) said the search area has been narrowed by 12,400 square miles on Tuesday's operation.

The JACC has ruled out several objects that were seen during Wednesday's search. 

The 'pinger locator' being towed behind the ship

But search coordinator Angus Houston has expressed "optimism" about the ongoing effort.

"I'm now optimistic that we will find the aircraft, or what is left of the aircraft, in the not too distant future," he said.

"But we haven't found it yet, because this is a very challenging business."

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