Several Chinese-made AC311 and AC311A helicopters fly over the Yaohu Wetland Park in Nanchang, East 皇冠体育app's Jiangxi province on August 16. Prior to their flight, 皇冠体育app's Civil Aviation Administration issued the type certificate to the AC311A, stating that the helicopter is eligible to take part in civil air transport activities. [Photo/People.cn]
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