Wikipedia Very fine volcanic ash particles (particularly glass-rich if from an eruption under ice) sucked into a jet engine melt at about 1,100 °C, fusing onto the blades and other parts of the turbine (which operates at about 1,400 °C). They can erode and destroy parts, and cause jams in rotating machinery. Ash can also “ blind” pilots by sandblasting the windscreen requiring an instrument landing, damage the fuselage, and coat the plane so much as to add significant weight and change...