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Probe as dozens of aircraft vanish

Friday, June 13 14:37:15

Dozens of aircraft briefly vanished from air-traffic control radars in Austria, Germany and the Czech Republic on separate occasions this week and last week, officials said, adding that they were now investigating the incidents.

Air-traffic controllers in Austria and Germany said data about the planes' position, direction, height or speed went missing on June 5 and June 10, but the outages posed no serious danger to people on the aircraft travelling at high altitude.

A spokesman for German Air Traffic Control said: "Planes disappeared from screens for a matter of seconds, here and there. The outages were sporadic and not grave."

"It must have been an external source of disruption. We are trying to identify the cause," the spokesman said.

In the wake of the disappearance of Malaysian Airlines flight MH370 in March there has been a growing focus on the tracking of passenger aircraft.

The airline industry has pledged to come up with proposals by September for a better system of tracking aircraft over oceans and other remote areas. But incidents in controlled airspace are relatively rare.

Europe's air corridors are among the densest in the world and there have been calls for better technology and coordination and a unified control network, although some air traffic controller unions oppose these measures.

In the recent incidents, extra air-traffic controllers stepped in in Austria and communicated with the affected planes by radio and took steps including increasing the safety distances between planes, a spokesman for Austro Control said.

He said that 10 planes transiting Austrian airspace were affected in the first incident and three in the second, and that he had heard that 50 aircraft were affected across Europe.

Austria's Die Presse newspaper said Slovakia was also affected. The Slovak air authority could not immediately comment on the report.

The incidents are being dealt with by European air navigation safety organisation Eurocontrol and EASA, the European air safety agency, he said. Neither of these bodies was immediately reachable for comment.

Richard Klima, spokesman for the Czech Air Navigation Service, said: "We saw random outages of aircraft detection within the system of the so-called secondary radar lasting several tens of seconds and up to several minutes. But thanks to the complete coverage of air space also through classic primary radars, we constantly had information about the positioning of airplanes and operational safety was not threatened."

Austrian media linked the events to electronic warfare exercises by the western military alliance NATO, which had no immediate comment.

A spokesman for Austria's defence ministry said the ministry was investigating the incidents but could not immediately confirm how many planes were involved. (Reuters)