Citation :
That terminal count took place about five hours later than planned because of technical issues, including a liquid hydrogen leak in a “quick disconnect” fitting for a bleed line that transfers that propellant from the core stage back to the pad. Efforts to stop the leak, including warming then cooling the fitting in the hopes of resealing the connection, failed. After lengthy deliberation, NASA managers elected to proceed with the terminal countdown from a preplanned T-10 minute hold after taking steps to mask, or hide, the warnings about the leak from computers.
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