Payload Assist Module
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 motors. 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:
* 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, was the last version in use. As of 2018, no PAM is in active use on any rockets.
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McDonnell Douglas
ORG
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Boeing
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Thiokol
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Space Shuttle
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Delta
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Titan
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satellite
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low Earth orbit
Concept
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Atlas
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Delta
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Star-48B
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Q156081
"Ulysses"
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Delta II
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Q1424161
Payload Assist Module
MISC
2018-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2018
DATE
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-48
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-63^^http://www.w3.org/2001/XMLSchema#decimal
-63
NUMBER
manufacturer
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