A section of Aer Lingus cabin crew have served notice of industrial action on the airline.
The staff, who are members of the IMPACT trade union, expect to start the action on Wednesday of next week. It is not expected to affect passengers using the airline.
The move concerns a row over new work rosters. The two sides have been in discussions over how to implement a recent report from the Republic's Labour Relations Commission.
The report concerns new rosters, which are aimed at increasing the working time of cabin crew to 850 hours a year.
Last night, the union said the action would be a work to rule. IMPACT claimed that it had reached an agreement with the company's human-resources department, but that this accord was subsequently overruled by "other senior management figures".
Aer Lingus could not be contacted for comment last night.