Admittedly, this weather hazard does not pose the most immediate danger to aviators every single day, but when it occurs, aviation is all but stopped. I found this out during the 2010 Iceland volcanic eruption, as a DoD Courier taking material over to Spain/Italy/Bahrain. During the eruption event, and even several times with Sicily's own Mt. Etna throughout the years, air traffic was brought to a near stand still because of the hazards of flying through volcanic ash.
https://www.youtube.com/watch?v=e-TMtRh8AIs
https://www.youtube.com/watch?v=OyZHZhYDWNk
When the ash is sucked into a turbine engine and becomes super heated, it basically turns to glass and can shred an engine. It can also cause exterior damage to the surface of the aircraft and cause effects similar to that of icing.
https://www.youtube.com/watch?v=3_5pxJjFFPk
References:
Holm, F. (2010) Retrieved from https://www.youtube.com/watch?v=e-TMtRh8AIs
NBC News (2014) Retrieved from https://www.youtube.com/watch?v=OyZHZhYDWNk
nakedtaoiseach (2010) Retrieved from https://www.youtube.com/watch?v=3_5pxJjFFPk
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