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Iceland Volcano's Ash Grounds European Air Travel
Ch_Omega writes "From the article at CBSNews: 'An ash-spewing volcano in Iceland emptied the skies of aircraft across much of northern Europe on Thursday, grounding planes on a scale unseen since the 9/11 terror attacks. British air space shut down, silencing the trans-Atlantic hub of Heathrow and stranding tens of thousands of passengers around the world. Aviation officials said it was not clear when it would be safe enough to fly again and said it was the first time in living memory that an ash cloud had brought one of the world's most congested airspaces to a standstill.'"
The BBC says "Safety group Eurocontrol said the problem could persist for 48 hours," and the Deccan Herald describes some of the effects on the ground in the volcano's home turf: "In Iceland, hundreds of people are fleeing rising floodwaters as the volcano under the glacier Eyjafjallajokull erupted yesterday again, for a second time in less than a month."
As watching endless episodes of Discovery channel would tell you ash has been responsible for plane crashes in the past. http://en.wikipedia.org/wiki/British_Airways_Flight_9
My cat can type words like Eyjafjallajokull too.
The last eruption was in 1821 and lasted 2 years... you better get yourself some train tickets if you want to travel in Europe!
They won't let planes fly near ash clouds as a safety measure. Reduces visibility, can wreck the windshield and probably the worst thing is that ash and jet engines don't get along. The reason it's getting so much attention is that there are many many flight paths that go near Iceland as it provides a shorter path between the two continents.
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The trouble with ash and aircraft is that, at the high temperatures found in jet engine combustion chambers, ash turns into a delightful material extremely similar to molten glass(you also have the less immediately dramatic; but still annoying, problem of having the ash particles basically sandblasting the surface of the aircraft).
Best case scenario: some rather expensive repairs, including replacing scratched glass and engine parts(or even entire engines).
Worst case scenario: Fiery death.
Not crashes, "just" 4-engine failures. All the cases I read about said once altitude was lowered the engines eventually started up again.
Having all your engines fail isn't minor, but it isn't on the same scale as an actual crash.
___________________ I want to be free()!
The ash cloud hit my city a few hours ago (Sweden). Other than the airports closed (and I don't understand why), nothing out of ordinary is going on.
Here in England you wouldn't know anything was happening. The dust is passing over at high altitude, so its only the planes that are affected. I'm sure we'd have had a very nice sunset if it hadn't been cloudy...
In a survey of 100 programmers, 111111 thought that duck-typing was a good idea.
Did you even read the link you posted?, that flight never crashed, it just lost power to all 4 engines for about 15 mins, but they eventually started up again.
I live in the Netherlands, am Scandinavian and side with Iceland on this issue. Please avoid collateral damage on us expats.
"Civis Europaeus sum!"
England and Iceland have been in a huff ever since a lot of English tax dodgers lost their fortunes in Icelandic banks that went tits up. The British have been threatening Iceland with everything, even including their major satire weapon weapon of mass destruction, "Viz" ( http://en.wikipedia.org/wiki/Viz )
The Icelandians have responded with volcanic gas.
Let's hope that this situation doesn't escalate.
Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
They closed the airports because the ash eats up jet engines, and can't easily be detected on radar. It's mostly silica and doesn't have a dielectric constant different enough from air to show up on most aircraft radar. So even if the cloud is thin enough on the ground to take off safely, you are relying on visual indications of the clouds thickening, and your visibility is poor so it's hard to see.
Any pissed off European travelers stuck in the airport reading /. may want to read KLM vs. Mt. Reboubt before hitting the friendly skies.
The ash cloud hit my city a few hours ago (Sweden). Other than the airports closed (and I don't understand why), nothing out of ordinary is going on. Sky a far away is a little bit more yellowish, nothing more. It also doesn't affect breathing as even normal street dust is more dangerous.
I'm curious as to how you claim that normal street dust is more dangerous. What do you base this on? Volcanic ash is mostly silicates, and based on what happens when you inhale other silicates (Asbestos) I wouldn't be too keen on the substituting volcanic ash for road dust.
As for why they would close the airports. It is a highly abrasive substance, and is very fouling. Running aircraft through a volcanic cloud is like subjecting it to several years of wear all at once, and not the normal wear that an engineer would design for. You would be running through your engines a very fine abrasive compound and at the same time reducing the performance of your engines as you have displaced some of the air. It can clog your machinery very quickly, especially non-jet engines. (Imagine running a piston engine and adding a highly abrasive and clogging dust to the fuel-air mixture.)
Out of modpoints but really liked a post? 1BDkF6TtmmeZ3yqXbz9yhdYVqRYnwFoXDj
First they fucked up our fishing, then they fucked up our economy, now they're fucking up our air. I say we INVADE these unpronounceable herring-botherers.
Well, I just had a beer with my little brother, a BA Pilot grounded here at our home in switzerland.
BA Flight 009 was special because it is the first such incident documented in a modern jet airliner. The pilots were pretty clouless when they suddenly saw funny flares through their front windows (cause by ash particles). "Somke" was reported from the cabin and after some time they piloted a very expensive glider plane (all 4 engines failed). The 747 has a glide angle of something about 1:15 which is very good for a heavy airliner. But with failing speed indicators it is quiet a challange to restart engines midair (windmill effect is used, they need to hold a certain speed before they can inject fuel and ignite it again).
I think these pilots back then did a tremendously good job if one takes into account that they had no fucking clue what was going on (today they have procedures for such situations, my brother showed me his checklist for such cases). And they had a lot of luck. The pilots lost height due to engine failure, decided to do a 180 turn and once the engines restarted (pretty low) they got into the ash cloud again and lost some engines again before they landed with reduced sight (sandpaper effect on the front window) and reduced IFR instrumentation at night.
Cheers,
-S
"Safety group Eurocontrol"... Eurocontrol is the European air traffic management center.
This sig is just as redundant as the rest of this posting
except for that whole high alt ash cloud.. that won't block out the stars any, nope
'...if only "Jumping to a Conclusion" was an event in the Olympics.'
"Having all your engines fail isn't minor, but it isn't on the same scale as an actual crash."
The amount of shear luck involved not to mention skill on the part of the pilots is just over the top.
Having a 747 loose all power and not crash is just short of proof of divine intervention.
Honestly that is probably the worst thing that could happen short of a crash and should be avoided at all costs.
See my blog http://ilovecookes.blogspot.com/ for light hearted technical information.
Uhm, I think it has more to do with the jetstream, which spreads the ash cloud over Britain.
It's not intercontinental flights that are shut down. It's ALL air traffic over northwest Europe.
This is actually untrue. Actual sand is not a problem for a modern jet engine - if you ever bothered to watch the A380 ads, one of the tests on the engine was when they fed a constant thick stream of fine sand into the intake of a running engine, and it was going just fine. It will certainly stress the engine, but it will keep running just fine for a very long time before sand starts to really wear out the internal mechanics to cause serious damage and shutdown.
Problem is that hot ash is actually not sand (which would not be able to stay that high in the air), but actual hot ash. As a result, as it goes through the engine, it coats the fuel feeding system and as it's rapidly cooled by compressed cold air pre-ignition, it becomes a glass-like material that blocks the fuel from getting into combustion chamber. This is what is causing the engine flameout. The reason why keeping the engine shut, putting plane into descent and keeping on trying to restart the engine is current modus operandi is because the glass-like substance that ash forms on the inside of the engine becomes very brittle when engine is being cooled by fast air stream going through it. As a result, when temperature drops below certain threshold, the normal vibration caused by drag and turbulence shatters the brittle mass, clearing the nozzles and allowing for fuel feeding to work again.
This is what happened in the 747 that lost all 4 of it's engines to flameout when flying through volcanic ash in the past. The report should be available to the general public, at least I recall reading it somewhere (though in finnish). In general, ash doesn't really scratch as much as stick to surfaces and solidify into dark glassy mass (which does in fact block the windows as well, meaning pilots would most likely have to land in instruments-only conditions in addition to handling engine flameouts).
According to a CNN article, the prime minister of Norway is stranded as a result of the resulting travel chaos and "running the Norwegian government from the U.S. via his new iPad".
ALING, Heathrow, Thursday (NTN) — Prime Minister Gordon Brown has condemned Iceland's terrorist attack on British air travel and their refusal to refund tourists' air tickets.
The UK government used anti-terrorism laws to freeze all British-held assets of Umhverfisráðuneyti, the Icelandic Ministry Against the Environment, after minister Kolbrún Halldórsdóttir threatened to further unleash the power of the Katla volcano in the wake of the devastation to school holidays caused by Eyjafjallajökull.
Thousands of confused and angry passengers wandered around Britain's becalmed airports today trying in vain to find out how long the disruption caused by the ash cloud might last. "Can't we just, you know, give the planes a try?" said Brenda Busybody, 54 (IQ), of East Cheam. "I wanted to go and rest on holiday, and Monday I'm back to doing nothing in the office. I pay my licence fee!"
The Prime Minister offered his outrage and sympathy, in lieu of money or anything useful. "This is fundamentally a problem with the Icelandic-registered El-stodth Thyonustah Voweld," said Mr Brown, attempting not to choke on his own tongue. "They have failed the people of Iceland and they have failed the people of Northern Europe! You pay my licence fee! Er, hold on ..."
Icelandic Prime Minister Jóhanna Sigurðardóttir also offered her sympathies to British travellers. "But, you know, we're still pretty upset about the cod."
http://rocknerd.co.uk
Re: your sig
If you learn of an Apple-Google-Nintendo merger, do not be troubled. For you are in Eyjafjallajokull, and are already dying of volcanic ash!
John
Reminds me of the old adage - "Red sky at night... volcanic ash in the atmosphere."
can wreck the windshield and probably the worst thing is that ash and jet engines don't get along.
I'm not sure what's worse for pilots - broken windshield when they are facing huge blow of wind or no engines.. without engines you can at least sit in the cockpit.
The reason it's getting so much attention is that there are many many flight paths that go near Iceland as it provides a shorter path between the two continents.
Actually everything around Baltic sea is currently no-flight zone. You can check out http://www.flightradar24.com/ to see that there's only single plane over northern part of Europe.
http://www.osha.gov/SLTC/silicacrystalline/index.html
OSHA seems that exposure to silica in the crystalline form is bad stuff.
http://volcanoes.usgs.gov/ash/health/#chronic
Volcanoes, like the one in Iceland currently erupting release large amounts of the stuff.
http://en.wikipedia.org/wiki/Yellowstone_Caldera#Volcanic_hazards
Think of the air traffic delay if Yellowstone went off!
http://en.wikipedia.org/wiki/Huckleberry_Ridge_Tuff
Check out the satellite imagery. The ash plume can easily reach into Europe.
It dissipates as it goes, but does anybody know the "critical density" before it's a problem?
broken windshield when they are facing huge blow of wind
It won't break the windscreen, just sandblast it. Great for bathrooms, not so good for visual approaches.
Which isn't what the parent said. Did you just want to wheel out your A380 advert anecdote? :) The parent said hot ash turning into molten glass-like substance is a problem for engines. Which you disagreed with, then repeated!
I'm looking for maps, but it doesn't seem to look that close...?
Note: rectangular maps of the world distort distances. Rectangular maps use some variant of a cylindrical projection* so as you approach the pole east-west distances appear larger than they really are.
Still it is a bloody big ash cloud (note: also because of winds it's neither circular nor centered on the source).
*The variants differ in how they deal with north/south distances. Mercator's projection (the most common afaict) modifies the north/south distances as well so local shapes are correctly represented. Peters projection modifies north/south distances in the opposite way so it preserves area but distorts local shape even more than a straight cylindrical projection does.
note: i'm known as plugwash most places but i screwd up registering that here somehow in the past and now can't register
An automobile's air filter will plug within minutes of being introduced to volcanic ash. Plug to the point of keeping the engine from running.
This was experienced during the Mt. Saint Helen's eruption in the United States. Stores sold out of pantyhose in very short order because people were using them to filter the ash so it wouldn't plug up the regular air filter.
It's a compound word: Eyja - Fjalla - Jökull
It's translated: Island - Mountain - Glacier
It's pronounced something like: Eh-ee-ah fee-at-law jeh-coot'l
- Henrik
- when the Shadows descend -
> An automobile's air filter will plug within minutes of being introduced to
> volcanic ash.
Only when there is a great deal of it: enough to impede visibility. The levels we are talking about here might cut the life of your air filter in half. Jet engines are much more sensitive to this sort of dust than internal combustion engines are. They inhale much, much, much more air, it is impossible to filter it, and they run hot enough to melt the silica.
Warning: this article may contain humor, sarcasm, parody, and perhaps even irony. Read at your own risk.
As Flight 9 approached Jakarta, the crew found it difficult to see anything through the windscreen, and had to make the approach almost entirely on instruments [...] He then called out how high they should be at each DME step along the final track to the runway, creating a virtual glide slope for them to follow. It was, in Moody's words, "a bit like negotiating one's way up a badger's arse".
British Airways pilots, always classy.
http://www.wolframalpha.com/input/?i=BIKF+to+EGLL
http://www.wolframalpha.com/input/?i=BIKF+to+EIDW
http://www.wolframalpha.com/input/?i=BIKF+to+ENGM
http://www.wolframalpha.com/input/?i=BIKF+to+EKCH
There is another, larger, volcano nearby called Katla and ...
"Eyjafjallajokull has blown three times in the past thousand years," Dr McGarvie told The Times, "in 920AD, in 1612 and between 1821 and 1823. Each time it set off Katla." The likelihood of Katla blowing could become clear "in a few weeks or a few months", he said.
Given this, and given that the last eruption was on and off for 2 years, we could have travel interruptions for a while to come.
When this Iceland volcano erupts, nearby Katla always goes up soon after. A major eruption of Katla could give us another "Year without a summer" in the northern hemisphere.
Help stamp out iliturcy.
I noticed a few people up above slightly confused about where Iceland is, based on misleading map projections. But WCBS radio (New York) this morning certainly gets the fail-prize for World Geography; their commentator noted how a volcano erupting "halfway around the world" was canceling flights from New York to London.
Nice going, guys. All the Londoners stuck in the airport who were listening now have an even worse opinion of American geographical knolwegde.
Ah yes, the icelandic trout. Most modern airliners now have somke detectors for just such problems.
Terror? More like inconvenience.
This eruption can go on for months, even years. To add insult to injury eruptions in Ejafjallajökull have historically been foreplay for eruptions in Mt. Katla which is a 100 square kilometer caldera that lies under nearby Mýrdalsjökull glacier. That eruption will be orders of magnitude bigger than this one. When Katla blows, and there is a good chance she will do so within the next two or three years or so if history is to be trusted, you can pretty much kiss air-traffic over much of Europe, or North America goodbye. Whose turn it is to not fly for a week or so at a time will depend on the wind direction and trust me, the economic damage of only being able to fly every other week for six months to a year is more than a mere "inconvenience".
Only to idiots, are orders laws.
-- Henning von Tresckow