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the engine back up to the commanded thrust level, the controller opened the oxidizer valves a bit more than normal. The hydrogen leak and increased oxidizer consumption resulted in the right engine deviating from the desired oxygen/hydrogen mixing ratio of 6.03 and running hotter than normal. The increased oxidizer consumption during ascent resulted in a premature shutdown of all three engines near the end of the projected burn due to low liquid-oxygen level sensed in the External Tank. Though the premature

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