Five firings of the Rocketdyne J-2 rocket engine were conducted in Test Cell J-4 of the Large Rocket Facility. The firings were accomplished during test period J4-1801-23 at pressure altitudes ranging from 105,500 to 113,000 ft at engine start to evaluate the effects of predicted Saturn S-II stage pre-fire conditions on J-2 engine start transients. Engine components were thermally conditioned to simulate the expected S-II interstage/engine thermal environment. Satisfactory engine operation was obtained. Accumulated firing duration was 56.3 sec.


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