Invest News DetailHurriyet - Turkish aircraft engine producer Tusas Engine Industries (TEI) and General Electric (GE) reached a new level in their partnership in designing aircraft engines. The new R&D center in Gebze Technology Free Zone will work on the design of new generation aircraft engines. TEI will also take a part worth USD 3 billion in the production program of the F-136 engine which will power the next generation of fighter aircrafts.