Ground crews assigned to the air force under the PLA Northern Theater Command conduct a foreign object debris walk with their two-wheel self-balancing electric scooters as a group of Y-5 transport aircraft sit abreast on the flightline prior to a recent flight training exercise in east China's Shandong Province. (eng.chinamil.com.cn/Photo by Li Laifeng, Wang Hongkang and Xiong Huaming)
