经过近3个月的紧张调查,美国“哥伦比亚”号航天飞机事故调查委员会(CAIB)在美国国家航空航天局事故调查组(NAIT)的帮助下,于4月20日公布了“哥伦比亚”号航天飞机失事原因的初步调查结果。调查结果是CAIB主任格曼在美国约翰逊航天中心的新闻发布会上公布的。该调查委员会认为,“哥伦比亚”号航天飞机在发射升空时其左翼遭到从外部燃料贮箱上脱落的泡沫绝缘材料撞击,结果造成 After nearly three months of intense investigations, the U.S. Columbia Space Shuttle Investigation Commission (CAIB) announced on April 20 with the help of NASA accident investigation team (NAIT) “Space shuttle crash preliminary findings. The result of the survey was released by CAIB Director German at a press conference at the Johnson Space Center in the United States. The Commission of Inquiry held that the space shuttle ”Columbia" was struck by the foam insulation on its left wing that landed on the external fuel tank when it was launched at launch