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Expert warns against 'experimenting' with flights in ashw/

500 flights cancelled Tuesday due to volcano: Eurocontrol
Brussels (AFP) May 24, 2011 - Around 500 flights were cancelled on Tuesday after an ash cloud from an Icelandic volcano blew over northern parts of Britain, European air traffic controllers said. The Volcanic Ash Advisory Centre (VAAC) found areas of high ash concentration over northern parts of Britain, according to Eurocontrol.

"As a result, approximately 500 flights were cancelled from the approximately 29,000 that would have been expected today across Europe," the Brussels-based agency said in an update on the air traffic situation. There is a "strong possibility" that the ash cloud may impact parts of Denmark, southern Norway and southwest Sweden by Wednesday, Eurocontrol said, citing the VAAC. "This would have some impact on flights. However, given the new procedures in place and the predicted movement of the ash cloud over the coming days, the actual impact on flights is expected to be relatively low."

EU doesn't expect widespread closure from volcanic ash
Brussels (AFP) May 24, 2011 - The European Union's transport chief said Tuesday he did not expect the Icelandic volcano ash cloud to provoke a widespread closure of European airspace like a similar event last year. Although airlines cancelled more than 250 flights as the cloud blew over Britain, Siim Kallas noted that this time the volcano, weather and European response are different than in April 2010, when an eruption caused chaos. "We are still looking at a very challenging week for passengers and for the airlines," the EU transport commissioner told a news conference, stressing that volcanic ash can still pose a safety risk to aviation.

"Although we are partly dependent on the weather and the pattern of ash dispersion, we do not at this stage anticipate the widespread airspace closures and the prolonged disruption we saw last year," he said. So far the flight cancellations were decided by individual airlines, he said. While the final decision to close the airspace remains in the hands of national, "we don't see this decision very near," Kallas said. He added that Europe has learned its lesson and is now better prepared to "avoid blanket closure" of the airspace. A European aviation crisis cell, comprising of the European Commission, EU states, airlines, airposts and the Eurocontrol air traffic control agency was activated after the Grimsvoetn volcano erupted at the weekend.

A system of high or low risk zones was also created last year, with a red zone of four grammes of ash per cubic metre. "It's airlines who then assess if they go into these zones," Kallas said. Last year, the plume from a different Icelandic volcano landed first in Scotland before spreading quickly across Britain and Ireland, then drifting across most of Europe. The biggest shutdown of airspace in the post-war era left many airlines -- and millions of stranded passengers -- deeply unhappy over halting flights.
by Staff Writers
Stockholm (AFP) May 24, 2011
Airlines and authorities should refrain from "experimenting" by flying planes through skies filled with ash from Iceland's erupting volcano, the author of a study on the impact of last year's ash cloud on aircraft said Tuesday.

"Neither you nor I would like to get on a plane where there would be any experimenting," said Susan Stipp, a geochemist at the University of Copenhagen who has headed a Danish-Icelandic study published last month on the dangers posed by the Eyjafjoell volcano's ash cloud.

She insisted airlines and aviation authorities should learn from the lesson of the Eyjafjoell eruption last April, which caused the planets biggest airspace shutdown since World War II, grounding more than 100,000 planes and stranding more than eight million passengers.

"There were a lot of people frustrated and a lot of money lost, but there were no lives lost as a result of plane failure," Stipp said.

"The air authorities made the right decision last time based on the fact that these particles were dangerous in certain proportions," she insisted.

Many critics, especially in the airline industry which was hard-hit by the 2010 airspace closures, have said the danger was exaggerated and called for more lenient rules, but Stipp and her team's study concluded the measures taken were largely warranted.

The ash particles from the Eyjafjoell eruption "were small so they went high and far. They were sharp, so they were a danger to airplane windows. It's like sand-blasting the airplane," she told AFP last month after publishing the study.

While there has yet to be a full analysis of the ash from Grimsvoetn, Stipp pointed out that the fact that the plume this time peaked at around 20 kilometres (12 miles) -- double last year's eruption column -- suggested the ash particles were as fine.

"I suspect that these particles are also dangerous," she said.

Several experts have described the first ash gathered as coarser and heavier than during last year's blast, and therefore less likely to be carried far afield and less dangerous to aircraft.

University of Iceland geophysicist Magnus Tummi Gudmundsson told AFP Tuesday the ash from Grimsvoetn was "not the same type as from the Eyjafjoell eruption," pointing out the ash causing trouble now "is typical basaltic ash."

However, he said, the ash "is quite light and fine-grained, but not quite as fine-grained as it was in Eyjafjoell."

Stipp meanwhile insisted aircraft makers do not have enough information to properly assess the danger of fine-particled ash.

Most of "their testing has been made in places like deserts, where the sand is rounded and the dust is rounded. It's a different composition" from ash, she said, pointing out that "volcanic ash particles are extremely sharp, like if you drop a beer bottle on a concrete floor."

There is some good news though: measurements showed Tuesday that Grimsvoetn's plume had shrunk to between three and five kilometres, indicating according to Stipp that the magma may no longer be coming in contact with ice and water, making the eruption less explosive and meaning far less ash.

earlier related report
Ash cloud will not ground Scandinavian flights: experts
Helsinki (AFP) May 24, 2011 - The giant cloud of volcanic ash spreading from Iceland will reach southern Sweden Tuesday night, but is not expected to be thick enough to prevent air travel, Finnish experts said Tuesday.

"At the moment it looks like the ash cloud will spread into southern Sweden at 2100 Finnish time (1800 GMT), and it looks as if it will be moving east, but we don't have an estimate as to when it might hit Finland," Raine Luojus, a spokesman for the country's aviation safety authority Finavia, told AFP.

"Most likely, it won't be so thick that it would prevent flights" in Scandinavia, he added, referring to estimates based on data from the Volcanic Ash Advisory Centre in London.

Airlines meanwhile halted dozens of flights to and from Scotland Tuesday as the volcanic ash cloud blew over Britain, even forcing US President Barack Obama to revise his travel plans and leave Ireland for Britain a day early.

In Sweden, flights were expected to run almost as normal Tuesday, except for possible cancellations to and from Scotland, according to a spokesman for the Swedish airport operator Swedavia.

"There are some indications that there might be (some ash) in western Sweden but those prognosis are still very uncertain," Anders Bredfell told AFP, adding though that Swedish authorities were preparing "for the worst-case scenario."

Iceland, which was forced to close its airspace a day after its Grimsvoetn volcano began erupting Saturday, had by Monday evening reopened its four international airports, including its main Keflavik airport near the capital Reykjavik.

On Tuesday, all flights from Keflavik appeared to be on schedule except the cancellation of one flight to London Heathrow and one to Manchester/Glasgow.

When Grimsvoetn, Iceland's most active volcano located at the heart of the country's biggest glacier, Vatnajoekull, in the southeast began erupting late Saturday, it shot up a plume of ash and smoke as high as 20 kilometres (12 miles) into the air.

In April 2010, a massive cloud of ash from the nearby Eyjafjoell volcano caused the planet's biggest airspace shutdown since World War II, with more than 100,000 flights cancelled and eight million passengers stranded.

The costs in terms of lost revenue and compensation to passengers were a body blow to the airline industry, particularly in Europe.

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