Report: Chinese ship hears pulse signal in south Indian Ocean

(CNN) -- A Chinese patrol ship looking for signs of Malaysia Airlines Flight 370 in the southern Indian Ocean discovered Saturday a pulse signal with a frequency of 37.5 kHz, state news agency Xinhua reported.

'That is the standard beacon frequency' for both so-called black boxes -- the cockpit voice recorder and the flight data recorder, said Anish Patel, president of pinger manufacturer Dukane Seacom.

'They're identical.'

The announcement came nearly a month after Malaysia Airlines Flight 370 disappeared, and on the same day that the nation's acting transportation minister said three committees were being formed to tackle the disappearance of the flight.

One will tend to the families of passengers aboard the missing flight, the second will oversee the investigation team and a third committee will handle the deployment of assets, said Hishammuddin Hussein.

Malaysia will also appoint an independent investigator to lead an investigation team, the acting minister said.

The team will include an airworthiness group, looking at issues such as maintenance records, and an operations group to examine aspects such as flight recorders and operations. A medical and human factors team will investigate issues such as psychology, he said.

As well as Malaysia and Australia, the team will include representatives from China, the United States, the United Kingdom and France, he said.

Hishammuddin also addressed 'unfounded allegations made against Malaysia,' which, he said, 'include the extraordinary assertion that Malaysian authorities were somehow complicit in what happened to MH370.'

He added, 'I should like to state, for the record, that these allegations are completely untrue.'

Hishammuddin pointed to a statement from the Association of Southeast Asian Nations, which says Malaysia has 'done its level best' in its response to an operation 'which is the biggest and most complex we have ever seen.'

The minister, who had earlier briefed ASEAN ministers and the United States on the search at a joint defense forum, thanked the United States for its 'unwavering support' and said the ASEAN ministers had pledged their continued cooperation.

The hunt for physical evidence continues Saturday -- both on the surface of the southern Indian Ocean and deep below it.

The British submarine HMS Tireless is now in the search area, Hishammuddin said.

Meanwhile, a parallel search for digital clues on the hard drives of a flight simulator in the home of one of the pilots turned up nothing conclusive.

There was no 'we got it' information, a U.S. official with knowledge of the investigation told CNN late Friday.

There were some 'curious' things, given the situation, the official said. The captain, Zaharie Ahmad Shah, had programmed several alternate routes into the simulator, but it appeared he had done so to come up with safe plans of action in case of emergencies aboard the plane, the official said.

The searches appear to be what an experienced and professional pilot would do, the official said.

Race against time to find pingers

In the choppy waters of the Indian Ocean, the hunt is not letting up.

The British Royal Navy survey ship HMS Echo and the Australian naval supply ship Ocean Shield began scouring for the plane's pingers and possible wreckage about 6,500 feet to 13,000 feet deep on the ocean floor Friday.

The search was along a single 150-mile (240-kilometer) track, said retired Air Chief Marshal Angus Houston, the head of the Australian agency coordinating the operation.

The race is on to find the missing Boeing 777's locator pingers before their batteries expire.

The acoustic pinger batteries on Flight 370's black boxes were due to be replaced in June, the Malaysia Airlines chief executive said Saturday.

'We can confirm there is a maintenance program. Batteries are replaced prior to expiration,' Ahmad Jauhari Yahya said.

The Ocean Shield has high-tech gear borrowed from the United States. That includes a Bluefin-21, which can scour the ocean floor for wreckage, and a Towed Pinger Locator 25, with its underwater microphone to detect pings from the jet's voice and data recorders as deep as 20,000 feet (6,100 meters).

'It is a very slow proceeding,' U.S. Navy Capt. Mark M. Matthews said of the second tool, which is towed behind a vessel typically moving at 1 to 5 knots.

Bill Schofield, an Australian scientist who worked on developing flight data recorders, said: 'If they do find it, I think it'll be remarkable.'

Up to 10 military planes and three civilian aircraft -- in addition to 11 ships -- will be looking Saturday for any sign of Flight 370, according to the Australian government.

The search area will be just under 84,000 square miles (217,000 square kilometers), which is slightly less than the area searched Friday, and will focus some 1,050 miles northwest of Perth. This is about 50 miles further from the western Australian city than was the case a day earlier.

Is this the right spot? Will they find anything? So far, all efforts to locate signs of the airliner have proven unsuccessful. Still, those involved have vowed to keep trying.

A member of the Royal New Zealand Air Force looks at a flare in the Indian Ocean on Friday, April 4, during search operations for Malaysia Airlines Flight 370. Authorities are combing thousands of square miles of the southern Indian Ocean in search of Flight 370, which disappeared March 8.Photos: The search for Malaysia Airlines Flight 370 Weather conditions and the MH370 search Vessels narrow search site for MH370 Prime ministers offer no answers

'Really, the best we can do right now is put these assets in the best location -- the best guess we have -- and kind of let them go,' U.S. Navy Cmdr. William Marks told CNN. 'Until we get conclusive evidence of debris, it is just a guess.'

'Long way to go'

Officials have repeatedly warned that the massive international search to find signs of the Kuala Lumpur-to-Beijing flight may not conclude any time soon.

In the case of Air France Flight 447, which crashed into the Atlantic Ocean in 2009, officials found debris on the surface after five days of searching. But it took them nearly two years to find the main pieces of wreckage, the flight recorders and many of the bodies of those on board.

With Flight 370, the search teams have even fewer clues.

Australian Prime Minister Tony Abbott warned that 'we cannot be certain of ultimate success in the search' for the Malaysian aircraft. He described it as the most difficult search 'in human history.'

Authorities have yet to explain why the plane flew off course or where it ended up.

Investigations into the 227 passengers and 12 crew members have yielded no suggestion that any of them might have been behind the disappearance.

CNN's Elizabeth Joseph and Tom Watkins contributed to this report.

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