Columbia Disaster

Shouldn’t they have checked this problem while they were in space?

During liftoff there was a minor problem during the
launch with a piece of insulating foam of the external fuel tank
fell from the shuttle during the launch on January 16th, but NASA
officials said at that time that they thought there was only minor
damage to left wing tiles - the covering that protects the orbiter
from extreme heat during the descent through the atmosphere at
incredible speeds.

From href="http://www.floridatoday.com/journal/020103landing.htm">www.floridatoday.com.