technical experts for that plane talking through the emergency -- now, this occurred shortly after takeoff, from what we're understand and the telegraph is reporting that the issue is with the right wing landing gear. now, we have not been able to confirm that at this point but that does present a pretty dynamic issue if it's one landing gear on either side that's not coming down. that can create a pretty big challenge for a pilot as they're coming in to land. we have dr. alan diehl who's a former ntsb investigator who's with us. doctor can you talk a little bit about what you've seen in the past in your experience with aircraft that have landing gear emergencies and how they're handled in this type of scenario? >> well, leah, you're absolutely right, it appears, the evidence is that this happened shortly after takeoff. so it's probably when the landing gears were being retracted. as i mentioned remember, there are four main landing gears plus