like he was going to pull one of those miss landing and go back up. and it did not happen. if we flipped, none of us would be here to talk about it. an official investigation will take months, if not years. we want to go to cnn s miguel marquez. what do we now know pending the investigation of the flight recorder and other things, what do we know that can be considered facts that will contribute to our understanding? reporter: a couple of important data points. passengers on the plane said they heard the engines refuse up just before it hit the embankment. the ceo of asiana airlines says it was no engine problems or callout to the passengers to brace or any emergency. we also know that sfo is under construction and the instrument
they re looking at the ils or instrument landing system for that particular runway was out. it was not operational. it had not been for on some time due to construction here at the airport. it s not clear if that played a role in what happened yesterday. the engines are also a big issue always in these investigations. the chairman of asiana airlines saying that he knew of no engine problems. but that left engine sort of disappeared. we didn t know where it went. so all those questions we ll be looking at. when we look at the totality of the information that we have now, i was talking to an expert earlier who said that it is true that by the end of the day, investigators may know what happened but not why it
ios, instrument landing system, that s only in weather. otherwise, you are on visual flight rules. they land all the time. they have their depth perception. so not having the ios on a clear day it was clear at this building, unlimited. was not a problem. should not have entered into this. shannon: okay. somebody with the airline has said there were not engine problems on the plane the ceo. does that suggest to you he has had a conversation with the pilots and he probably has an initial assumption about what happened. i think it does, which is a little bit troubling because if it wasn t an engine problem and if it wasn t he said his pilots were very experienced, intimating that they couldn t have made a mistake. then where is it? it s one of two things. huan engine problem or you had a pilot error. now, it could have been a flight control problem, but nowhere along the line do they say, ear call out, we are having flight
miles short. instead, he ended up right up there. imagine being jolted out of your sleep only to see the pilot and a plane in your apartment. disaster narrowly averted. may day, may day. reporter: a single engine prop plane crashes through the roof of this three-story apartment building in a suburb just outside washington, d.c. the pilot, 61-year-old william larson, desperately calls for help reporting his cessna cardinal had engine problems, electrical failures, and low fuel. heading toward dulles. emergency requested. fuel remaining? i think that s our problem. we re not going to make the airport. reporter: seconds later, he nose dives through the roof of david ventura s living room. we heard an explosion and came out to the door. it seems like all the dry wall
had to be diverted in british air space. a kuflt fighter jet was scrambled to escort the plane to stanstead airport outside of london. a pakistanie official said two passengers got into an altercation with flight attendants and threatened to blow up the plane. the incident is being treated as a criminal matter and did not mention a terrorist angle. a british airways jet was forced to make an emergency landing at london s heathrow airport. it encountered engine problems shortly after taking off this morning. thick black smoke could be seen coming from the airline s right engyp. gin. a bit of a slipup today by president obama on his way to the naval academy in annapolis. he didn t return the marine salute as he boarded marine one, but quickly made up for it, getting back off, shaking the marine s hand and speaking with him briefly before departing. while the president is not required to return a salute,