[irjustin]

That's what Feynman's issue was as he reported it in the Roger's Commission[0]. Is they _didn't_ understand the risk when they thought.

Management thought the risk of lost was 1 in 100,000 which is launching everyday for 274 years. Engineers polled was 1:50 to 1:200. Obviously a massive disconnect.

The thing that gets me is they broke their own protocol operating below 53'F. This wasn't a calculated risk where it's 1-2 degrees out of spec, it's wildly out of spec, below freezing into a completely unknown, untested and un-spec'ed space.

This is what frustrates me.

[0] https://en.wikipedia.org/wiki/Rogers_Commission_Report#Role_...

[hef19898]

Since we are already comparing Challenger to Chernobyl, that fact is a common thread isn't it? Ignoring temp specs, and at Chernobyl they ignored power and operation specs. In case of Challenger to get a launch, and in case of Chernobyl to conduct a test.