PERTH, Australia (CBS News) -- U.S. Navy equipment has picked up signals consistent with the pings from aircraft black boxes, an Australian search official said Monday, describing the discovery as "a most promising lead" in the month-long hunt for the missing Malaysia Airlines plane.

Angus Houston, the head of a joint agency coordinating the search in the southern Indian Ocean, called it "very encouraging" but warned it may take days to confirm whether signals picked up by the ship Ocean Shield are indeed from the flight recorders on Flight 370.

"Clearly, this is a most promising lead, and probably in the search so far, it's the probably the best information that we have had," Houston said at a news conference.



He said the position of the noise needs to be further refined, and then an underwater autonomous vehicle can be sent in to investigate.


The Ocean Shield was continuing to comb the area to try pick up the signals again, Houston said.

After a month-long hunt for answers filled with dead ends, Monday's news brought fresh hope. The two black boxes, which contain flight data and cockpit voice recordings, are the key to unraveling exactly what happened to Flight 370 and why.

But there is little time left to find the devices, which contain critical flight data and cockpit voice recordings that could help investigators unravel exactly what happened on board Flight 370. The devices have beacons that emit "pings" so they can be more easily found, but the beacons' batteries last only about a month. Tuesday marks exactly one month since the plane disappeared.

The plane vanished March 8 during a flight from Kuala Lumpur, Malaysia, to Beijing with 239 people on board, setting off an international search that started off Vietnam and then shifted to the southern Indian Ocean as information from radar and satellite data was refined.

The length of the search and lack of any information on the cause of the plane to go so far off course has transfixed the world.

If the Ocean Shield manages to pick up the signal again, the crew will launch a Bluefin-21 autonomous sub that can dive to about 14,800 feet, and scan for wreckage. Given the fact that the sea floor in the area is approximately that deep - and even deeper in some spots - the sub will be operating to the limits of its capability, Houston said.

Houston cautioned that it was too early to say the transmissions were coming from the black boxes on the missing passenger jet.

"I would want more confirmation before we say this is it," he said. "Without wreckage, we can't say it's definitely here. We've got to go down and have a look, and hopefully we'll find it somewhere in the area that we narrowed to."

Meanwhile, officials were trying to determine whether two separate sounds heard by a Chinese ship about 345 miles away from the Ocean Shield were related to the plane. The patrol vessel Haixun 01 first detected a brief "pulse signal" on Friday at the same frequency used by the airliner's black boxes. The ship detected a second signal on Saturday within 1.4 miles of the original signal, this one lasting for 90 seconds. Houston said China also reported seeing floating white objects in the area.

A British navy ship, the HMS Echo, with sophisticated sound-locating equipment, arrived Monday in the area where the Chinese ship picked up signals.




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