Sorry, I don't know much about the incident details. Maybe R. L. Rieger reads pprune if we are lucky!
Heavy ashfall from the June 15, 1991, eruption of Pinatubo volcano in the Philippines caused this World Airways DC-10 to set on its tail. About 4 cu km of ash was erupted on June 15. It accumulated to depths of 10-15 cm at this airfield at the Cubi Point Naval Air Station, 40 km SSW of Pinatubo.
Photo by R.L. Rieger, 1991 (U.S. Navy).