KATHMANDU, July 5, 2016 (Xinhua) -- A Chinese engineer conducts periodic maintenance for the China-made air carrier Modern Ark (MA) 60 at the hanger of Nepal Airlines in Kathmandu, Nepal, July 5, 2016. Chinese plane manufacturing company AVIC International Holding Corporation has completed the first big periodic maintenance of Chinese-made Modern Ark (MA) 60. (Xinhua/Sunil Sharma)