kwateow,
Volcanic ash moves around in the atmosphere and so do aircraft, which means the two entities have a chance of encountering each other regardless of where ash residue is at any one time. As ash build-up in an engine doesn't necessarily cause immediate damage (ie: it's an accumulation), failure could have been caused by ash at a location anywhere in the world at any time after previously flying through ash if an accumulation went unnoticed.
I'm not speculating that ash was any way involved, but you appear to lack any sense of logic with your assertions. This looks bad for you seeing as you like to comment on other peoples' lack of laguage/logic skills.
As for the standard of your written work - particularly concerning your grammar and punctuation, please refer to your own post about education.