Two fresh signals have been picked up in the search for missing Malaysia Airlines Flight MH370, raising hopes yesterday that wreckage would be found within days, even as the black box batteries start to expire.
Australian ship Ocean Shield detected the signals on Tuesday to match a pair of transmissions picked up over the weekend that have been analyzed as consistent with signals from the plane’s flight data recorder, the head of the search said.
“Ocean Shield has been able to reacquire the signals on two more occasions, late yesterday afternoon and later last night,” said Angus Houston, head of the Joint Agency Coordination Centre.
The ship has now picked up four transmissions, crucial information as searchers try to pinpoint the crash zone for the Malaysia Airlines Boeing 777 that disappeared on March 8 with 239 people on board.
Officials had feared that the signals which were initially picked up might not be detected again, particularly since the batteries on the black box tracking beacons have a normal lifespan of about 30 days.
The new transmissions, found in the same broad area as the previous two, lasted for 5 minutes, 32 seconds and about 7 minutes respectively, Houston said.
“Yesterday’s signals will assist in better defining a reduced and much more manageable search area on the ocean floor,” Houston said. “I believe we are searching in the right area, but we need to visually identify the aircraft before we can confirm with certainty that this is the final resting place of MH370.”
Houston again urged caution for the sake of the families of those aboard the flight, which mysteriously vanished en route from Kuala Lumpur to Beijing, and said the search for more signals would go on.
“Hopefully, with lots of transmissions we’ll have a tight, small area and hopefully in a matter of days we’ll be able to find something on the bottom that might confirm that this is the last resting place of MH370,” Houston told reporters.
The hunt was narrowing, with experts confirming the first transmissions were consistent with black box recorders.
“The analysis determines that a very stable distinct and clear signal was detected at 33.331kHz and that it consistently pulsed at a 1.106 second interval,” Houston said. “They therefore assessed that the transmission was not of natural origin and was likely sourced from specific electronic equipment. They believe the signals to be consistent with the specification and description of a flight data recorder.”
Authorities have been searching a linear arc produced from satellite data and believed to represent the last stretch of the plane’s flight path.
While China’s Haixun 01 vessel initially reported some acoustic signals at the southern end of this trajectory, these have not occurred again, Houston said.
No other ships will be allowed near the Ocean Shield as its work must be done in an environment as free of noise as possible, but a modified RAAF AP-3C Orion was parachuting sonar buoys into the vicinity.
These float on the surface and have a hydrophone attached dangling below to hopefully pick up any emissions, although officials warned these could be dulled by thick silt on the seabed.
With the clock ticking on how long the black boxes could feasibly continue to transmit, Houston said it would not be long before a US-made autonomous underwater vehicle called a Bluefin 21 would be sent down to investigate.
Houston said officials were probably close to using this device because the last acoustic signal was very weak, indicating the batteries were running down.
“I don’t think that time is very far away,” he said.
He said the Ocean Shield could search six times the area with the towed pinger locator that could be done with a sonar on the Bluefin.
Up to 11 military aircraft, four civil planes and 14 ships were searching yesterday over a zone covering 75,423km2, Australia’s Joint Agency Coordination Centre said.
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