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日本第一枚运载同步通信卫星的H-2火箭,因第一级助推器的LE-7型低温液氧液氢发动机试车连续失败而受到威胁。 4.月份,LE-7发动机进行了4次全程365s试车,但均提前关机。这些试车都是在因技术问题而中断试车后重新恢复试车的。在1月16日第二次成功试车达到标定时间350s后仅一周,一次试车工作了340s时不得不因液氢涡轮泵的涡轮叶片断裂而关机。从1991年5月1日第一次成功试车350s以来,试车不断受挫。去年5月16日,对改进后的涡轮叶片进行评估的一次液氢涡轮泵试验,以爆炸而告结束。去年8月,又由于一次小的爆炸而使试验推迟,在这次主喷注器管的压力试验中炸死一名工
The first H-2 rocket carrying synchronous communications satellites in Japan was threatened by the continuous failure of the first-stage booster LE-7 liquefied liquid hydrogen-hydrogen engine. 4. In April, the LE-7 engine carried out 4 full 365s test runs, but all shut down early. These tests are due to technical problems and stop the test after the resumption of test run. In January 16th the second successful test to achieve the calibration time of 350s only one week, a test run of 340s had to shut down the turbine blades of liquid hydrogen turbo pump. Since the first test run of 350s on May 1, 1991, the test has been continuously frustrated. On May 16 last year, a liquid hydrogen turbo-pump test to evaluate the improved turbine blades ended in an explosion. In August last year, the trial was postponed due to a small explosion and a worker was killed in a stress test on the main injector tube