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[i]Low frequency oscillations (14 to 16 hertz) experienced on the S-II Stage resulted in a 132-second premature center engine cutoff. Preliminary analysis indicates that a "Trust OK" pressure switch cutoff occurred due to large pressure oscillations in the LOX system. No apparent engine or structural damage was incurred. Oscillations in the stage and outboard engines decayed to a normal level following center engine cutoff. Preliminary data does not indicate any off-nominal performance of the four outboard engines.[/i]
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