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１９９９年９月４日，日本宇宙开发事业团和三菱公司成功地进行了一次ＬＥ－７Ａ发动机的长程试验，试验是在种子岛航天中心进行的，所用发动机是两台鉴定试验发动机中的２号发动机。这是这台发动机进行的第４次长程试验。这次试验原计划进行３５０ｓ，但实际试验时间为３４
On 4 September 1999, NASDA and Mitsubishi Corporation successfully conducted a long-range test of the LE-7A engine at the Tanegashima Space Center using two of the two certified test engines engine. This is the fourth long-range test conducted by this engine. The test was originally planned for 350s, but the actual test time was 34