Experiment-carrying truss carried in the space shuttle cargo bay. Based on the original SPAS structure (but without the avionics and attitude control) flown on the Spacelab D-1 and D-2 missions.
Status: Operational 1985. First Launch: 1985-10-30. Last Launch: 1993-04-26. Number: 2 . Apogee: 332 km (206 mi).