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A picture taken off a computer monitor shows a piece of unknown debris floating just under the water from a Royal New Zealand P3 Orion while it searches for missing Malaysia Airlines flight MH370, over the Indian Ocean on March 31, 2014. No time limit will be imposed on the search for MH370 because the world deserves to know what happened, Australian Prime MinisterTony Abbott said, as a ship equipped to locate the plane's "black box" prepared to set sail. (AFP)
Authorities were racing the clock Tuesday to find the "black box" of missing Flight MH370 before its signal goes silent, as Malaysia admitted it got the last words from the cockpit of the doomed plane wrong.
Australian vessel Ocean Shield, fitted with a US-supplied black box detector known as a "towed pinger locator" left Perth Monday but is expected to take up to three days to reach the search zone in the remote southern Indian Ocean.
A black box signal usually lasts only about 30 days and fears are mounting that time will run out, after the Malaysian Airlines plane carrying 239 people veered off course and vanished on March 8.
Australian Defence Minister David Johnston admitted there was only a slim chance it would be found as debris needs to be positively identified first to nail down a crash site.
"We've got about a week (left), but it depends on the temperature of the water and water depth and pressure as to how long the battery power will last," he told national radio.
Authorities are scouring a massive expanse of ocean for clues and even if the zone is narrowed down, Ocean Shield must tow the equipment at just five kilometres per hour (3.1 mph) for the pinger to be able to pick up a signal.
Despite a far-reaching multinational search of the vast and desolate seas nothing has yet been identified, with repeated sightings of objects turning out to be fishing gear or flotsam.
If floating MH370 debris is eventually found, authorities plan to analyse recent weather patterns and ocean currents to determine where the plane went down.
Malaysia believes the flight, en route from Kuala Lumpur to Beijing, was deliberately diverted by someone on board and that satellite data indicates it crashed in the Indian Ocean.
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