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There were 21 RS-25D Block 2 engines made. Two of them never flew. Three of them were lost with the Columbia disaster. 16 of them are tagged for SLS's use, including 14 previously flown, and the two never flown. Where are the last ones, which engines are not tagged for use of SLS and where are they now? Which serial numbers are the two that will not be included in the SLS program?

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  • $\begingroup$ I suspect the missing ones are 6007 and 6013, although I have no idea what happened to those two... $\endgroup$ – PearsonArtPhoto Jan 8 at 22:55
  • $\begingroup$ Just to be sure - are you asking about the powerheads (which have the 6xxx serial numbers ) or the engines themselves (which have the 2xxx serial numbers) ? $\endgroup$ – Organic Marble Jan 8 at 23:04
  • $\begingroup$ Fair question. It seems that there were 21 Block 2 powerheads made, and maybe 7 more engines. I guess I'm asking about the powerheads with the associated engine, if it still exists... $\endgroup$ – PearsonArtPhoto Jan 8 at 23:11
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It appears that the 20 engines are all accounted for.

(Note that the chart from Wikipedia lists engine 2048 twice (once with powerhead 6007 and once with powerhead 6021).)

Here is the list of engines, their planned usage, and their last Shuttle flight.

  • 2043 / none at present / STS-108 L SSME
  • 2044 / SLS launch # 4 / STS-133 C SSME
  • 2045 / SLS launch # 1 / STS-135 R SSME
  • 2047 / SLS launch # 2 / STS-135 C SSME
  • 2048 / SLS launch # 3 / STS-133 L SSME
  • 2049 / lost in STS-107 failure
  • 2050 / SLS launch # 4 / STS-120 C SSME
  • 2051 / SLS launch # 4 / STS-132 L SSME
  • 2052 / SLS launch # 4 / STS-132 C SSME
  • 2053 / lost in STS-107 failure
  • 2054 / SLS launch # 3 / STS-131 R SSME
  • 2055 / lost in STS-107 failure
  • 2056 / SLS launch # 1 / STS-121 C SSME
  • 2057 / SLS launch # 3 / STS-134 R SSME
  • 2058 / SLS launch # 1 / STS-133 R SSME
  • 2059 / SLS launch # 2 / STS-134 C SSME
  • 2060 / SLS launch # 1 / STS-135 L SSME
  • 2061 / SLS launch # 3 / STS-134 L SSME
  • 2062 / SLS launch # 2 / never
  • 2063 / SLS launch # 2 / never

20 engines, 16 to be expended in 4 SLS flights, 3 lost in the STS-107 failure, and one with a TBD future

enter image description here

Sources

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  • $\begingroup$ So then what happened to 2043 and 2046?? $\endgroup$ – PearsonArtPhoto Jan 9 at 1:36
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    $\begingroup$ 2043 is sitting around. We don't talk about engine 2046 $\endgroup$ – Organic Marble Jan 9 at 1:39
  • $\begingroup$ Any idea where 2043 is? All of the engines at KSC were sent to the SLS program, is it just sitting as a spare for the program? Also, I see a 2036-2042, on the list of engines according to Wikipedia... $\endgroup$ – PearsonArtPhoto Jan 9 at 1:42
  • $\begingroup$ on 2043, I would imagine so. It's an outlier because it has never flown in the full Block II configuration, only IIA, so no flight history in its current configuration. Those hyphenated engines are ones that got upgraded/rebuilt from older configurations, they had lower serial numbers before. $\endgroup$ – Organic Marble Jan 9 at 1:44
  • $\begingroup$ Okay, gotcha. So there is then only one engine, and two powerheads, that are not accounted for. $\endgroup$ – PearsonArtPhoto Jan 9 at 2:09

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