Maintenance men assigned to an aviation regiment with the PLA Navy's North China Sea Fleet check the engine system of a KJ-200 airborne early warning (AEW) aircraft prior to the flight training at a military airfield in coastal area of east China's Shandong Province on January 3, 2018. (eng.chinamil.com.cn/Photo by Xing Yun and Xie Junjie)
