VC wants Eurowings to ease pilots' workloads by, for example, cutting the amount of time a pilot would have to be on duty or increasing their rest periods, it said in a statement.
"It is not enough to sit at the negotiating table - you also have to be willing to find a solution and not present counter-demands as an offer," said VC head Marcel Groels.
Get a FREE Digital Subscription!Enjoy full access to Hospitality Ireland, our weekly email news digest, all website and app content, and every digital issue.
A Eurowings board member, Kai Duve, said in a statement that the demands endanger the viability of the airline.
The pilots had voted 97.7% in favour of strike action in a vote in August.