Why Iceland volcanic eruptions seriously affect United Kingdom England air? _BBC perspective

Iceland volcanic eruption produced a large number of volcanic ash clouds, causing several days in and out of the United Kingdom's flight cancellations. How long does Iceland volcanic eruptions on the flights to United Kingdom resulted in serious ? this and January 15, 2009, New York, a plane hit by birds fell Hudson River (HudsonRiver) of similar. First of all, the ash contains a large number of rock and glass particles, these particles such as blade-like solid. The aircraft engine works is: the outside air intake, compression, and then press out from the other side, the output power-propelled. Therefore the air with volcanic ash, once inhaled, will damage the engine, the consequences would be unthinkable. Volcanic ash also possible in the engine's high temperature melts, and condensation, causing damage to the aircraft mechanical parts. Given the weather conditions cause a large number of volcanic ash from Iceland to South across Scotland and the North Sea, all the way to enter the United Kingdom over the central area. Therefore, for security reasons, the United Kingdom has suspended flights related areas. Historical accident in 1982, the United Kingdom London Heathrow Airport (Heathrow) to fly to New Zealand Auckland (Auckland) flights suffered after the forced landing Indonesia volcanic ash. At that time, West Java (West Java) by Michael can root mountain (MountGalunggung) volcanic eruptions. Volcanic ash damaged aircraft all four engines, aircraft glide over 25 minutes later, the pilot was able to restart the three engine, complete the landing. A month later, a Singapore aircraft fly over the same area, the three-engine aircraft, and the United Kingdom, the plane shell damaged seriously. United Kingdom public has little effect on daily life, weather radar is currently not yet detect volcanic ash, ash is dry, but this radar can detect wet substances in the air. The naked eye, United Kingdom around the outdoor landscape as usual, but regional volcanic ash float, see the exception of the sunset red. Although the threat of volcanic ash on the plane, but at present very large floating to 6000-11000 m altitude, the United Kingdom's population does not have to worry about the impact on the body. However in Iceland, volcanic eruption caused the River to rise nearly 3 meters, hundreds of people forced to flee their homes, the Government also proposes to livestock poultry farmers in indoor, avoid inhalation of sharp volcanic ash particles. Last Wednesday was El AfA-DERA glaciation within one month after the second eruption. Europe is expected to resume on Monday to half of the air traffic as a unit over Europe Iceland volcanic ash clouds begin to move, EU officials expressed the hope that Monday (19) as many as half of the European air traffic will be restored. Including Lufthansa, Air France and British Airways, several approaching a safety test flight, did not find any problems. However, in the United Kingdom over a scientific test, concluded that the situation is still very dangerous. A United Kingdom scientists accept the BBC interview, they were found in low-altitude six layers of different volcanic ash cloud, some of them more than a few days ago. He said, this is very worrying, and said that no one knows that in those circumstances flight safety limit what.