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原标题:震撼时刻

长征五号发动机发生爆炸瞬间
2016年11月3日,一个值得中国航天界永久纪念的日子。这一天,在文昌发射场、距发射塔架3公里处,我亲历了长征五号运载火箭首次发射的全过程。曾经看过多少次发射,连我自己都记不清了,唯有这一次,最是撼人心魄——这是长征五号运载火箭的首次发射。据统计,各国运载火箭首飞成功的概率是50%。这次发射会属于概率的哪一半呢?
01指挥员胡旭东的位置在大厅的中心。他下着口令,十几个系统指挥员跟着重复口令,自信而又浑厚的声音在大厅里回荡。1980年出生的胡旭东,显得比实际年龄老成许多。10天前,我和他匆匆见过一面,当时他只说了一句话:“这次首发一定要成功,它的意义非同一般……如果不成功,对中国航天的打击,那就太大了。”他的话让我马上生出一个祈祷:长征五号啊,你可千万别掉链子,让另一半的概率见鬼去吧!
瞭望3公里外的塔架,像一座华丽的宫殿,“胖五”则像等待出嫁的美丽公主,充满魔幻般的魅力。我在心里道了一声:亲爱的,一路平安。转回指挥大厅时,第一个“惊心动魄”便扑面而来,时钟刚好走到10:30。胡旭东的口令洪亮有力又略带低沉:“各号保持状态,暂不进入-7小时程序。”大厅里,一波小震荡。“保持状态,暂不进入……”谁都明白这意味着什么。
发射塔架1、3助推火箭上疑似液氧泄漏。听见“泄漏”两字,就是一个纯粹的外行,心头也会猛然一颤。加注过程最让人担心的就是燃料泄漏。我听过太多这方面的事故。液氢液氧是极低温的易燃易爆的燃料,它们充填到火箭肚子里,极易汽化,加上发射场地域三高(高盐雾、高温、高湿),就更难伺候,一旦泄漏出来,想想就知道有多可怕。
指挥部里有一半的人纷纷走出大厅,去小会议室参加紧急会议。他们要根据航天人特有的“双五条”归零标准,逐一开展故障排查。两位副总师赶往101阵地现场勘察、摸排故障情况时,小会议室里早已争论得面红耳赤了。这个会开得像甲乙两方谈判,当大家还在为“故障”归不归零争论不休时,发射站站长唐功建却点出了眼下最紧迫的问题:程序是停还是继续?当专家们一致同意归零时,一个小时已经过去了。发射窗口变更,01指挥员胡旭东下达口令:“重置点火时间为——19:01:00。”
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