NASA conducted a J-2X rocket engine test on Dec. 14, the 10th firing in a series of tests on the new upper-stage engine for NASA's Space Launch System. The J-2X engine was test fired on the A-2 Test Stand at NASA's Stennis Space Center, in south Mississippi. The main focus of this <br />test was to characterize engine performance calibration and the effects of fuel inlet pressure variations. The results of this test are being analyzed.<br /><br />The engine -- No. 10001 -- now will be removed from the test stand to allow for addition of a nozzle extension and associated test facility modifications needed for additional engine tests in 2012. The J-2X engine is being developed by Pratt & Whitney Rocketdyne for NASA's Marshall Space Flight Center in Huntsville, Ala.
