1 min readJ-2X Powerpack on A-2 Test StandNASAJul 19, 2012 Image Article Stennis Space Center engineers and technicians watch as the J-2X powerpack is hoisted into place in the A-1 test stand Dec. 5. Image credit: NASA/SSC Stennis Space Center engineers and technicians watch as the J-2X powerpack is hoisted into place in the A-1 test stand Dec. 5. Image credit: NASA/SSC