PICTURES: Finnish F-18 engine check reveals effects of volcanic dust

http://www.flightglobal.com/articles/2010/04/16/340727/pictures-finnish-f-18-engine-check-reveals-effects-of-volcanic.html
"The images show that short-term flying can cause substantial damage to an aircraft engine," the air force says. Continued operation could lead to overheating and potentially pose a threat to the aircraft and its pilot, it adds.