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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 '20 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) ? $\endgroup$ Jan 8 '20 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 '20 at 23:11
  • $\begingroup$ This is a fantastic question! $\endgroup$ Dec 9 '20 at 19:02
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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.

Engine Planned Use Last Shuttle Flight
2043 none at present STS-108 L
2044 SLS launch # 4 STS-133 C
2045 SLS launch # 1 STS-135 R
2047 SLS launch # 2 STS-135 C
2048 SLS launch # 3 STS-133 L
2049 STS-107 R, destroyed
2050 SLS launch # 4 STS-120 C
2051 SLS launch # 4 STS-132 L
2052 SLS launch # 4 STS-132 C
2053 STS-107 L, destroyed
2054 SLS launch # 3 STS-131 R
2055 STS-107 C, destroyed
2056 SLS launch # 1 STS-121 C
2057 SLS launch # 3 STS-134 R
2058 SLS launch # 1 STS-133 R
2059 SLS launch # 2 STS-134 C
2060 SLS launch # 1 STS-135 L
2061 SLS launch # 3 STS-134 L
2062 SLS launch # 2 never used
2063 SLS launch # 2 never used

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 '20 at 1:36
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    $\begingroup$ 2043 is sitting around. We don't talk about engine 2046 $\endgroup$ Jan 9 '20 at 1:39
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    $\begingroup$ @OrganicMarble why don't we talk about 2046? $\endgroup$
    – Ludo
    Dec 9 '20 at 20:07
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    $\begingroup$ @Ludo I was essaying a jest. I would have to do some research to see why they skipped that serial number. As a guess, it got ruined during manufacture or test. $\endgroup$ Dec 9 '20 at 20:19
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    $\begingroup$ "Affordable"? While no doubt the SSME has excellent performance and is reliable in service, there's nothing "affordable" about using a reusable engine in a disposable configuration! $\endgroup$ May 5 at 17:38

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