NASA declared the final test of the Space Launch System's solid rocket boosters a success June 28. The Qualification Motor 2 (QM-2) test, carried out at Orbital ATK's Utah test site, fired a five-segment solid rocket booster cooled to the lower end of its operating range of temperatures. Agency officials said at a post-test press conference that an initial review of the data collected during the two-minute test indicated the booster performed as expected. NASA will use two of the shuttle-derived boosters on its Space Launch System heavy-lift rocket, whose first launch is on track for late 2018.
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机译：美国国家航空航天局于6月28日宣布成功对太空发射系统的固体火箭助推器进行了最终测试。在轨道ATK的犹他州试验场进行的Qualification Motor 2（QM-2）试验发射了冷却至较低温度的五段固体火箭助推器其工作温度范围的末端。该机构官员在测试后的新闻发布会上说，对两分钟测试期间收集的数据进行的初步审查表明，助推器的性能达到了预期。美国宇航局将在其航天发射系统重型火箭上使用两个航天飞机衍生的助推器，该火箭的首次发射将于2018年末进行。
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