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美航宇局研制航天飞机主发动机上的新液氧和液氢涡轮泵的计划已经受到预算压缩的影响。新涡轮泵寿命时间为55次飞行,累计工作时间将近7.5小时,计划于1994年开始使用。虽然新的氧化剂涡轮泵仍能在1994年开始使用,但新的液氢涡轮泵的鉴定计划将要推迟到氧化剂泵通过飞行验证之后,这就大大地推迟了两个涡轮泵一起参加飞行的时间。因为现在的火箭达因公司研制的泵在仅仅经过6次飞行之后即发现过早的磨损而需要进行大修,所以1986年航宇局选择普拉特·惠特尼公司研制新
Plans by NASA to develop new liquid oxygen and liquid hydrogen turbo-pumps on the main engine of the shuttle have been subject to budgetary compression. The new turbo pump life time of 55 flights, the cumulative working time of nearly 7.5 hours, scheduled to start in 1994. Although the new oxidizer turbo pump can still be used in 1994, the qualification of the new liquid hydrogen turbo pump will be delayed until the oxidizer pump passes the flight verification, greatly delaying the time for the two turbo pumps to join the flight together. Because now the rocket Daine company developed the pump only after 6 flights that premature wear and need overhaul, so in 1986 NASA chose Pratt Whitney to develop new