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An emotional interview. a doctor opening up about the impact, but not one, but two mass shootings have had on her staff, on herself and her family. cnn's lucy kafanov got access to san antonio university hospital, where several victims were taken. >> get the glide scope in there, please. >> reporter: at san antonio's university health hospital , doctors and nurses prepare to receive the most critically wounded. it is one of the busiest trauma centers in the nation. as cnn got exclusive access inside, as pediatric trauma medical center director dr. lillian leal and her team demonstrated prepara...

Landing system on the runway may be key, called the glide scope, the gps system that glides planes in. right before that runway there's a hill and seconds before the crash the cockpit alarm went off saying sink rate, meaning the plane is descending too fast, seven seconds later hit trees and struck the hill. for context you'll remember back in san francisco, at tasiana aircraft in july that airport did not have the glide working. >> do we know how long it was before they got the big main runway open? >> really a couple minutes. 45 seconds after the air traffic controller asked the ups if they ...

Flight as mike indicates, started earlier. what were they doing? we'll listen to it. there are checklists, approach plans to review. they should review the notams that are out. notice to airmans that say the glide slope it off. we will find out, i think, that these pilots didn't do a very thorough approach and got behind the plane. and by the time the stick shaker goes off, it's too late. >> the glide scope, a radio beam that shows you how the approach should take place. i've read, and i'm not a pilot, i've read if you don't have that beam and coming in over water, your approach is over water,...

777 a number of years ago and he said to me you almost have to purposely try to crash this thing because it's built with so many redundant systems, such a great aircraft, it's really built to try to, you know, ensure that even if you make a mistake it compensates for you. what happened in this crash? nobody knows yet for sure. >> nbc's tom costello, thank you. steve ratner, the redundant systems that tom was talking about, not only on the plane but on the ground as well. there were issues on the ground with i believe the runway being repaired in some way, a glide scope not working. >> there wa...

Brain so we can learn from it. >> are there not redundant systems that would have flashed -- if everything were working well that would have flashed and said too steep, too slow? wouldn't that have been in place? >> well, you know, there are a lot of systems that help support the pilots as they come into airports especially busy ones like this one at san francisco. there's been a discussion about the glide scope being out of service. but there are a number of other tools available to the pilots, some less sophisticated like the lights, precision approach lights that they were talking about. bu...