Cecco, some operators are doing it with some success - on another forum i have just suggested that maybe it is worth the UK CAA borescoping the operators that have been flying with some regularity over the duration of the ash plume in order to ascertain if any damage has occurred - this should be a more accurate reflection of long term wear (if any) - and this should re-assure one way or another the true results ??
i apologise if this is slight thread drift.