. . . . . "Payload Assist Module"@en . . . . . "The Payload Assist Module (PAM) is a modular upper stage designed and built by McDonnell Douglas (now Boeing), using Thiokol Star-series solid propellant rocket engines. The PAM was used with the Space Shuttle, Delta, and Titan launchers and carried satellites from 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 Shuttle, different versions of the PAM were developed:"@en . . . "The Payload Assist Module (PAM) is a modular upper stage designed and built by McDonnell Douglas (now Boeing), using Thiokol Star-series solid propellant rocket engines. The PAM was used with the Space Shuttle, Delta, and Titan launchers and carried satellites from 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 Shuttle, different versions of the PAM were developed: \n* PAM-A (Atlas class), development terminated; originally to be used on both the Atlas and Space Shuttle \n* PAM-D (Delta class), uses a Star-48B rocket motor \n* PAM-DII (Delta class), uses a Star-63 rocket motor \n* PAM-S (Special) as a kick motor for the space probe Ulysses The PAM-D module, used as the third stage of the Delta II rocket, is the only version in use today."@en .