The search was narrowed in April after a series of acoustic pings thought to be from the plane’s black box recorders were heard along a final arc where analysis of satellite data put its last location.
But a month later, officials conceded the wreckage was not in that concentrated area, some 1,000 miles off the northwest coast of Australia, and the search area would have to be expanded.
“The new priority area is still focused on the seventh arc, where the aircraft last communicated with satellite. We are now shifting our attention to an area further south along the arc,” Australian Deputy Prime Minister Warren Truss told reporters in Canberra.
Truss said the area was determined after a review of satellite data, early radar information and aircraft performance limits after the plane diverted across the Malaysian peninsula and headed south into one of the remotest areas of the planet.
The next phase of the search is expected to start in August and take a year, covering some 60,000 sq km at a cost of $56 million or more. The search is already the most expensive in aviation history.
The new priority search area is around 2,000 km west of Perth, a stretch of isolated ocean frequently lashed by storm force winds and massive swells.
Two vessels, one Chinese and one from Dutch engineering company Fugro, are currently mapping the sea floor along the arc, where depths exceed 5,000 meters in parts.
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