A hazard assessment was conducted on the GRC managed payloads in support of a NASA Headquarters Code Q request to examine STS-107 payloads and determine if they were credible contributors to the Columbia accident. This assessment utilized each payload's Final Flight Safety Data Package for hazard identification. An applicability assessment was performed and most of the hazards were eliminated because they dealt with payload operations or crew interactions. A Fault Tree was developed for all the hazards deemed applicable and the safety verification documentation was reviewed for these applicable hazards. At the completion of this hazard assessment, it was concluded that none of the GRC managed payloads were credible contributors to the Columbia accident. Schoren, William R. and Zampino, Edward J. Glenn Research Center NASA/TM-2004-213050, E-14486 WBS 22-101-46-01; WBS 22-400-31-30-01 SPACE TRANSPORTATION SYSTEM FLIGHTS; ACCIDENT INVESTIGATION; SPACE SHUTTLE PAYLOADS; HAZARDS; SPACECRAFT RELIABILITY; FAULT TREES