PAM-D 1920x1080

PAM-D with the Phoenix spacecraft. The stage is successively spun, fired, yo-yo de-spun and jettisoned.

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.[1] Originally developed for the Space Shuttle, different versions of the PAM were developed:

  • PAM-A (Atlas class), development terminated; originally to be used on both the Atlas and Space Shuttle
  • PAM-D (Delta class), uses a Star-48B rocket motor
  • PAM-DII (Delta class), uses a Star-63 rocket motor
  • 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.

2001 re-entry incidentEdit

On January 12, 2001, a PAM-D module re-entered the atmosphere after a "catastrophic orbital decay".[2] The PAM-D stage, which had been used to launch the GPS satellite 2A-11 in 1993, crashed in the sparsely populated Saudi Arabian desert, where it was positively identified.[2]



External linksEdit

Template:Upper stages

This page uses Creative Commons Licensed content from Wikipedia (view authors). Smallwikipedialogo.png
Community content is available under CC-BY-SA unless otherwise noted.