Abstract
The LE-5A engine is now under development for the 2nd stage of H-II launch vehicle. Its qualification test has begun in this summer. Two engineering model engines (EM engine) were already tested in 1988 and early 1989, and the results of its 40 hot firings — 52 starts involving the restart, and 3311 seconds of total duration — proved 12.4 tonf thrust and 452 second Isp at mixture ratio 5.0 in vacuum. According to feasibility study on hot firing tests of the idle mode operation, its adoptable operation rating was determined, and hot firing tests in this condition were conducted successfully.
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