PAM (Payload Assist Module) is a modular upper stage operated with solid propellant, used with Space Shuttle, Delta, and Titan launchers. The rocket was used to carry satellites from a low earth orbit to a geostationary transfer orbit or an interplanetary course. The payload was spin stabilized by being mounted on a rotating plate. Originally developed for the Space Shuttles, different versions of the PAM followed:
Today the PAM-D is only used as the third stage of the Delta II.
NASA wrestles with new shuttle troubles; the shuttle's vexatious engines are resisting some heroic troubleshooting. (National Aeronautics and Space Administration)
Jul 20, 1984; NASA Wrestles with New Shuttle Troubles For the last several weeks, it has been a multimillion dollar mystery. Just 4 seconds...