Did anyone boroscope the Dornier afterwards, to see if the contaminants (at this concentration) did actually stick?
That was my immediate thought when I saw the clip of them wheeling it away afterwards. If that was my aeroplane, I would have the engineers peering into its soul before it had a chance to cool.
The bloke I saw being interviewed said he was an Aeronautical Engineer and from what he had seen; 'he wouldn't want to put my aeroplanes up there at the moment.'
Having said that, he did say the layers weren't all dust. Some of them were the gas products of the eruption and, although unpleasant, would not be as destructive as the pumice dust.
Roger.