MTU Maintenance is based in Zhuhai on the southern coast of Guandong Province. It is a joint venture between the German company, MTU Aero Engines Holding AG, and China Southern Airlines.

It has just won a contract worth 90 million euros ($128 million) from Norwegian Air Shuttle ASA to maintain 44 of the company’s aircraft engines for five years.

MTU Aero Engines and China Southern Airlines each own 50% in the joint venture, which was founded in 2002. (Note that MTU is, itself, originally a joint venture between Daimler Benz and MAN although it is now wholly owned by Daimler Benz.)
Source: Center for Pacific Aviation