Chinese vessel detects pulse signal in ocean in hunt for flight MH370

Chinese vessel detects 'pulse signal' in ocean in hunt for flight MH370
But experts urge caution, with no link confirmed to black box of missing Malaysia Airlines plane
PUBLISHED : Saturday, 05 April, 2014, 3:31pm
UPDATED : Sunday, 06 April, 2014, 4:22am
Teddy Ng in Kuala Lumpur
teddy.ng@scmp.com

The Chinese patrol and rescue vessel Haixun 01 in the southern Indian Ocean. It has been taking part in the search for flight MH370 since March 20. Photo: Xinhua
A Chinese patrol vessel in the southern Indian Ocean has detected a pulse signal that could be from the black box recorder of flight MH370, state media said yesterday.

A black box detector deployed by Haixun 01 picked up a pulse signal of 37.5 kHz per second at around 25 degrees south latitude and 101 degrees east longitude, Xinhua reported.

View MH370: possible locations in a larger map

But officials and experts urged caution as there was still no confirmed link between the signals and the black box from the Malaysia Airlines plane, now missing for more than four weeks.

Chinese search planes also reported spotting white objects in the ocean.

Search chief Angus Houston, head of the Joint Agency Co-ordination Centre based in Perth, said: "White objects were sighted on the surface about 90 kilometres from the detection area.

"However, there is no confirmation at this stage that the signals and the objects are related to the missing aircraft."

The underwater locator beacon on the black box of a Boeing 777 can transmit an ultrasonic pulse from as deep as 4.3 kilometres under water.

But the signal will be silenced when the battery runs out - usually after about 30 days.

As many as 13 planes and 11 ships are involved in the hunt for MH370 - which vanished on March 8 with 239 people on board - in an area 1,700 kilometres northwest of Perth.

Li Jie, a researcher at the PLA Navy's Military Academy, said the detection was an important breakthrough. "Only the black box will release such a pulse signal," he said.

"If no other plane has crashed in that location then, basically, we can say that flight MH370 is located somewhere around these waters," he said.

Rear Admiral Yin Zhuo told state-run CCTV that it was highly likely the signal was from the black box of MH370.

"The area is not a major route for commercial jets and vessels, and therefore the chance that the signal is from another crashed airliner is minimal," he said.

But Australian Defence Minister David Johnston urged caution after several false leads in what has been an "emotional roller coaster" for the families of those on board the plane.

He said: "This is not the first time we've had something that has turned out to be very disappointing. There's a huge chance of a false positive here."

Watch: How does a 'black box' work?

The Chinese Maritime Rescue Centre also warned there was no confirmed link between the pulse signal and the missing plane.

Chris Yates, an aviation security consultant based in Britain, warned that the black box would now be in a "rundown state" with its battery being exhausted.

"The range of the transmission from the black box will have decreased significantly over such a period of time," he said.

"That will cast doubts on the veracity of the claimed findings."

He added that the position where the signals were detected seemed to be further north than the current search area.

In Beijing, relatives of passengers on the flight said they did not believe the pulse signal was from the plane. One said: "We should rather wait for official confirmation than listen to unconfirmed sources of information."

Another family member said: "I just hope this is not true. I won't believe it until they have found the wreckage and bodies."

Haixun 01 was one of the first batch of Chinese vessels sent to help in the search for MH370.

It is the largest and most advanced China-produced patrol and rescue vessel and arrived in the southern Indian Ocean on March 20.