Unions have expressed concern for over 400 jobs at the Lufthansa Technik Airmotive plant in Rathcoole, Co Dublin after staff were summoned to a general meeting at 2pm tomorrow.

The company, which maintains aircraft engines, is a subsidiary of German firm Lufthansa Technik AG - the maintenance repair and overhaul subsidiary of Lufthansa German Airlines.

Airmotive was founded in 1980 by Aer Lingus but became part of the Lufthansa Technik group in 1997.

In 2011, it had a turnover of $205m (€152m). It employs 411 staff.

The company has recently been in dispute with staff over funding a pension deficit recently estimated at around €10m.

During the summer, union members at the company overwhelmingly rejected a proposal for the company to inject €12m into the pension scheme, while staff would have faced some increase in contributions and reduction in benefits.

Arthur Hall of the Technical Engineering and Electrical Union said he was concerned about what might emerge at tomorrow's meeting.

He said he hoped that jobs would not be in jeopardy.

Mr Hall said that there had been an air of uncertainty hanging over the plant for some time in relation to the management's intentions.

He noted that the company used to employ up to 700 people, but that workers had suffered numerous rounds of redundancy in the interim.