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[i]Structurally, a 1-2-2 start is desired for minimizing the start and liftoff dynamics caused by thrust buildup of the engines ... The planned 1-2-2 F-1 engine start sequence ( engines 5, 3-1, 4-2 ) was not achieved. Two engines are considered to start together if both thrust chamber pressures reach 100 psig within 100 milliseconds. By this definition, the starting order was 2-1-1-1 ( engines 5-3, 1, 4, 2 ) ... The desired 1-2-2 start sequence was also not achieved on flights AS-507, AS-508 and AS-510.[/i]
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