<Li> Charles E. Yeager, retired Air Force general and the first person to break the sound barrier in level flight </Li> <Li> Alton G. Keel, Jr., executive director of the commission </Li> <P> The commission found that the Challenger accident was caused by a failure in the O - rings sealing the aft field joint on the right solid rocket booster, causing pressurized hot gases and eventually flame to "blow by" the O - ring and contact the adjacent external tank, causing structural failure . The failure of the O - rings was attributed to a design flaw, as their performance could be too easily compromised by factors including the low temperature on the day of launch . </P> <P> More broadly, the report also determined the contributing causes of the accident . Most salient was the failure of both NASA and its contractor, Morton Thiokol, to respond adequately to the design flaw . The Commission found that as early as 1977, NASA managers had not only known about the flawed O - ring, but that it had the potential for catastrophe . This led the Rogers Commission to conclude that the Challenger disaster was "an accident rooted in history ." </P>

The roger's commission had concluded that the problem in the challenger case was
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