TUSAŞ Engine Industries (TEI), established in 1985 as a joint venture of Turkish Aerospace Industries, GE Aerospace, the Turkish Armed Forces Foundation, and the Turkish Aeronautical Association, is Türkiye’s aerospace-engine manufacturer and global design center. TEI designs, develops, manufactures, assembles, tests, and maintains aircraft and helicopter engines, engine parts and modules, and related systems for commercial and military aviation, while supporting international programs and maintenance, repair, and overhaul services.