2 ms·

Basically, they assumed that because all the damage they saw wasn't a threat to the orbiter that it couldn't be a threat to the orbiter. The orbiters could sur

Basically, they assumed that because all the damage they saw wasn't a threat to the orbiter that it couldn't be a threat to the orbiter. The orbiters could survive holes in the heat shield in most places so long as they weren't too numerous, but there were some key spots that would result in a loss. They saw hundreds of spots of damage and decided it was just a nuisance, they never considered that there could be spots that wouldn't just be a nuisance. Beancounters unwilling to acknowledge a problem until it was decisively proven--and the only proof was a loss of the orbiter.

bumby 4y ago
Kinda, but that’s not the full story. They didn’t realize the foam was physically capable of producing that damage. For one, the deltaV was higher than previous incidents because of when it occurred in the flight profile. And secondly, the foam demonstrated unknown characteristics at those speeds. They didn’t find that out until they tested the case afterwards and, since they couldn’t reproduce the effect, they basically said “let’s turn it up to 11 for shits and giggles and see what happens.” And voilà, the foam suddenly acted in an unexpected way that produced more damage. It wasn’t really a “beancounter” issue. It came from the fact that we have imperfect models of physical systems and sometimes we encounter issues outside the boundaries of those model assumptions.