In the span of a few seconds, a smooth countdown to launch Space Shuttle Mission STS-93 ... igniters started as another precursor to main engine ignition that occurs just under seven seconds ...
Ignition typically occurs in the mid-afternoon ... Designed in the 1970s as the Space Shuttle Main Engine (SSME) for the Shuttle Program, the engine’s original rated power level (RPL) of 100 ...
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