The instrument landing system necessary for auto landing is out of commission in SFO on runway 28L, due to construction, so the Asiana pilots had to make a manual landing, something they rarely do. That is why thy crashed. I'm on the road at the moment, typing this on my phone, I'll give more details when I get home. I'll be making a manual landing at LAX tomorrow, about 2pm local time. Be sure to watch CNN, I'll wave to you Ding!
Don't let Ding's ball busting distract you too much while you are on that approach. In fact, please don't think of him at all. ;-)
