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2013年11月25日,C919大型客机翼身组合体综合验证项目中机身、外翼翼盒总装大部段在中航飞机西飞成功下线。此次下线的C919大客翼身组合体大部段在核心制造技术上实现了多项突破:首次在国产机型上采用激光成型件加工中央翼缘条,首次采用铝锂合金材料加工机身蒙皮,采用20mm超厚机翼蒙皮数控喷丸成形技术、17m机翼折弯长桁加工技术。中国商飞公司副总经理、C919大型客机项目总设计师吴光辉、中航工业副总经理耿汝光及中航飞机西飞总经理何胜强等有关负责人参加了下线仪式。
November 25, 2013, C919 large passenger wing composite body integrated validation project fuselage, wing wing box assembly most of the successful completion of the China Eastern Airlines XAC fly off the assembly line. The off-line C919 wing big body of the body most of the components in the core manufacturing technology to achieve a number of breakthroughs: the first time in domestic models using laser forming parts of the central flange, the first use of aluminum lithium alloy processing machine Body skin, using 20mm thick wing skin CNC shot peening technology, 17m wing bending long girt processing technology. Vice general manager of China Commercial Aircraft Company, Wu Guanghui, chief designer of C919 large-scale passenger aircraft project, Geng Ruguang, deputy general manager of AVIC and He Shengqiang, general manager of AVIC XAC, attended the off-line ceremony.