Locator Pinger News Today : Breaking News, Live Updates & Top Stories | Vimarsana

The plane under water? first, they will likely listen for it. >> this is a hydrophone. >> reporter: all commercial airplanes are required to carry pingers. underwater locator beacons attached to the black boxes. they emit a ping once a second. james coleman is a senior hydrographer a company that makes technology used just for this purpose. >> it's an underwater microphone. you're going to put it together and tow it behind the vessel and use it to listen for the locator pinger. >> reporter: but unlike the extreme depths of nearly three miles in the indian ocean where mh-370 disappeared, the ja...

Of a company which makes that underwater locator pinger that everybody is searching for. he also got to hear and confirm the first set of pings detected by australian search teams. so chris, i know earlier this week you told cnn you were extremely confident the sounds were from the flight's black box. now search teams have reported hearing four pings. is there any doubt in your mind that sound is coming, in fact, from flight 370? >> no, there's no doubt. the acoustic signature of the beacons and the cadence they're coming from is definitely from one of our beacons. so we're very confident that...

Batteries are completely dead because that bluefin-21 could emit some sounds that could screw up the towed locator pinger? >> right. it's not possible that we're going to hear another one. it's a large area to search and it's going to take some time but at least it's not as large as it used to be. >> is four pings enough to find this box? >> i think they have stated the more the better. so -- >> they have four. one for two hours, one for 15 minutes, two for five or six minutes. is that enough, within a 17-mile span or whatever, to go down three or four miles or whatever to find that box? >> th...

They're searching in the right location for the missing plane. the reason that they're so confident is that they've actually picked up signals again which they believe are from the black boxes of the aircraft. the australian ship ocean shield heard the signals again tuesday afternoon and evening while dragging a locator pinger from the u.s. in the search area west of perth, australia. the signals were in the same area as those detected at the weekend. and those sounds have now been analyzed. and australian authorities believe they come from a flight data recorder. >> i believe we are searching...

Hours. the australian ship heard the signals tuesday afternoon and evening while dragging a locator pinger from the u.s. the signals were in the same area as those detected over the weekend and those sounds have been analyzed and authorities think it's the recorder. >> satellite issues. >> thank you. we'll check back again. >> here is the thing, four pings, 3 1/2 mile radius. they don't want to drop the submersibles down until they get more of a tighter area. but it's very tempting. it's tempting 'cause they really feel as though they've got it, they're on top of it, but they want to get close...