Search for missing 777 likely to shift south

CANBERRA, Australia — The next phase of the underwater search for the missing Malaysian passenger jet will focus on an area of the Indian Ocean hundreds of miles south of the first suspected crash site, a senior investigator said Friday.

Martin Dolan, chief commissioner of the Australian Transport Safety Bureau, said an announcement will be made next week on where a 23,000 square mile search of the ocean floor for wreckage using powerful sonar equipment will be focused.

Dolan said he expected the probable crash site would be hundreds of miles south of where a remote-controlled underwater drone scoured 330 square miles of seabed in the first fruitless search that ended last month. That search area was defined by acoustic signals suspected to have come from the missing plane’s black boxes, which promised to be the best clue to finding Malaysia Airlines Flight 370. But those signals are now widely thought to have come from some other source.

The new search area will not be based on new data, but on refined analysis of existing satellite information from the doomed Boeing 777 after it veered off course during a flight from Kuala Lumpur to Beijing on March 8.

“All the trends of this analysis will move the search area south of where it was,” Dolan said. “Just how much south is something that we’re still working on.”

“There was a very complex analysis and there were several different ways of looking at it. Specialists have used several different methodologies and bringing all of that work together to get a consensus view is what we’re finalizing at the moment,” he said.

Private contractors are expected to start the new search far off the west Australian coast in August using powerful side-scan sonar equipment capable of probing ocean depths of 4.3 miles. The job is expected to take up to 12 months to complete.

Two survey ships are currently mapping uncharted expanses of seabed in the search zone before the sonar scanning starts.

The search area is in the vast expanse of ocean that was thoroughly swept for floating debris by search aircraft in the weeks after the plane disappeared with 239 passengers and crew aboard. No trace of plane has been found.

Dolan said the new search area will not be as far southwest of the coastal city of Perth as the initial air search had focused, near the limit of planes’ range and in storm-prone seas.

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