Bob Ebeling, an engineer at NASA contractor Morton Thiokol, played a crucial role in the Challenger disaster by warning against the launch due to concerns over cold temperatures affecting the O-ring seals. Ebeling, along with four other engineers, attempted to halt the launch in 1986, fearing that the seals would fail and lead to catastrophic consequences. His efforts were not heeded, resulting in the tragic explosion. Ebeling spent much of his life grappling with guilt over the incident but found peace before his passing at age 89.
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Bob Ebeling (89) spent a third of his life consumed with guilt about the explosion of the space shuttle Challenger. But at the end of his life, his family says, he was finally able to find peace.
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Ebeling was one of five booster rocket engineers at NASA contractor Morton Thiokol who tried to stop the 1986 Challenger launch. They worried that cold temperatures overnight — the forecast said 18 degrees — would stiffen the rubber O-ring seals that prevent burning rocket fuel from leaking out of booster joints.
"We all knew if the seals failed, the shuttle would blow up," said engineer Roger Boisjoly in a 1986 interview with NPR's Daniel Zwerdling.
Ebeling was the first to sound the alarm the morning before the Challenger launch. He called his boss, Allan McDonald, who was Thiokol's representative at the Kennedy Space Center in Florida.