China completed two more ground tests for the Y-20, its biggest home-grown transport aircraft, following its successful maiden flight on January 26. Tang Changhong, Chief Designer of the Y-20, or Transport-20, said it took five years for Chinese designers to manufacture and test-fly the jumbo air freighter. Other large strategic air freighters in active service globally include the Antonov An-225, the Ilyushin Il-76 and the Boeing C-17 Globemaster III. The Y-20 will serve as China’s jumbo transport aircraft “over a very long period of time”. It will probably be put in service within five years. The 15-meter-high Yun-20 has a load-carrying capacity of 66 metric tons and a maximum take-off weight of 200 tons. Domestically designed and manufactured engines will be tested and once they have passed, they will replace the Russian engines which are currently used. The Chinese engines perform better in terms of fuel efficiency and thrust-weight ratio.