> The Challenger disaster could perfectly well have been avoided if they had been willing to look.
The tragedy of Challenger is that Morton Thiokol engineers did look enough to know that the O-ring design was likely to fail under cold weather conditions. This was already a known issue and the engineers specifically recommended that Challenger postpone launch because of the temperature at the pad the night before the launch.
They got overruled... almost certainly for what amounts to political reasons as the big bosses didn't want to throw off the timing of the media-hyped "first class taught from space".
Still remember watching the Challenger launch on a CRT TV propped up on an AV cart in an 8th grade classroom and it being a big deal that a teacher was going up in space.
[−]apical_dendrite · 2026-11-15 Sun 02:23 UTC ·
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The decision to ignore the Morton Thiokol recommendation not to launch wasn't made at NASA HQ. There was a late night teleconference between Morton Thiokol, Marshall Space Flight Center (where the SRB program was managed) and personnel from Marshall and Morton Thiokol on the ground in Florida. The Marshall leadership put a lot of pressure on Morton Thiokol execs to withdraw their recommendation, and Morton Thiokol caved. My recollection is that it's unclear how much if anything was communicated to NASA HQ. These were the people who had taken over after von Braun's retirement, so very much from an engineering rather than a political background.
I don't think that the "teacher in space" part was much of a factor in Marshall's decision-making. There was clearly plan-continuation bias, and there was a clear directive that Marshall should not be responsible for delaying a launch. The management style they had inherited from von Braun also meant that disagreement was highly discouraged. The data was ambiguous enough that they could convince themselves that everything was fine and Morton Thiokol was coming up with a new launch requirement at the last minute.
The person at Morton Thiokol who caved was neither qualified nor authorized to make the decision. The Morton Thiokol engineers said no, and their executives backed them up, but NASA administrators kept asking Morton Thiokol employees that were out of the loop, until they could pressure on into saying yes.
There's a really well written and researched book on the topic, that I highly recommend, called Truth, Lies, and O-Rings by Allan J. McDonald, James R. Hansen, and Jonathan Yen
The tragedy of Challenger is that Morton Thiokol engineers did look enough to know that the O-ring design was likely to fail under cold weather conditions. This was already a known issue and the engineers specifically recommended that Challenger postpone launch because of the temperature at the pad the night before the launch.
They got overruled... almost certainly for what amounts to political reasons as the big bosses didn't want to throw off the timing of the media-hyped "first class taught from space".
Still remember watching the Challenger launch on a CRT TV propped up on an AV cart in an 8th grade classroom and it being a big deal that a teacher was going up in space.
I don't think that the "teacher in space" part was much of a factor in Marshall's decision-making. There was clearly plan-continuation bias, and there was a clear directive that Marshall should not be responsible for delaying a launch. The management style they had inherited from von Braun also meant that disagreement was highly discouraged. The data was ambiguous enough that they could convince themselves that everything was fine and Morton Thiokol was coming up with a new launch requirement at the last minute.
There's a really well written and researched book on the topic, that I highly recommend, called Truth, Lies, and O-Rings by Allan J. McDonald, James R. Hansen, and Jonathan Yen