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新华社呼和浩特12月25日电（记者邹简朴）记者从我国商飞C919大型客机耐寒测验发动典礼上得悉，C919大型客机已于25日抵达内蒙古呼伦贝尔海拉尔东山机场，全面敞开高寒专项实验试飞。
C919大型客机现在正敞开多机场、多区域协同试飞形式，全线进入高强度、高效率、高质量飞翔实验阶段。高寒实验试飞是民用飞机有必要经过的一项极点气候实验，以验证飞机在极寒气象条件下各体系爱x视频和设备的功用和功能契合适航规范。
C919国产客机，座级158-174座，航程4075-5555公里，2007年正式立项，2015年首架机在我国商用飞机有限责任公司总装制作中心下线，2017年完成首飞，方案于2021年取得主管部门颁布的适航证并交付使用。
呼伦贝尔市冬天平均气温在零下25℃左右，国家气候中心确定的"我国冷极"就在其境内。得天独厚的冷资源为开展机动车、航空器等工业品耐冷性测验发明了绝佳条件。
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