4383 - The main landing gear door is where the foam/ice hit. But the real problem was the foam on the external tank, and my post at 4303 covers it fairly well.
There is no way to make the shuttle more safe unless they solve the problem of the foam on the ET.
Take a look at the article:
http://www.freerepublic.com/focus/f-news/835531/posts?page=4303#4303
The new ultralight tanks and some modifications on the formed ramps would eliminate this particular problem from happening again.
It is that simple!
Of course, other changes to the insulating foam package could have been done over a period of months and years while the shuttle still flew.
The likelihood of a totally different problem causing a loss of craft is actually much better than a repeat of the foam problem experienced in this incident.IMO
just my two pennies worth.