Hi,
Under pressure from airlines, EASA proposes to amend the regulations so that flights through the ash clouds are possible under the responsibility of the operators.
Risks are known. They are listed in EASA CRD to NPA 2011-17
http://hub.easa.europa.eu/crt/docs/viewcrdpdf/id_136
The FAA does not agree and indicated very clearly in his comments: EASA should withdraw this proposal for the reasons explained below (page 8):
And this severe remonstrance against the EASA
