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"Had to be..." is not quite true. How the SSME/RS-25 was designed to operate and could be operated is not the same as how NASA chose to operate it. Particular
by ThenAsNow 10y ago
"Had to be..." is not quite true. How the SSME/RS-25 was designed to operate and could be operated is not the same as how NASA chose to operate it. Particularly after Challenger.