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427 to flight 585. both airplanes were on approach, both rolled and dove into the ground or unknown reasons. >> the two flights have something else in common. both airplanes are boeing 737s. >> the most widely used jet in the world. the second time something unexpected had happened and resulted in the loss of an airplane. if another one went down, they were going to ground the airplane. and the ramifications for grounding the 737 were unbelievably severe. this sets off a global economic catastrophe. we had to find out what happened. coming up -- another boeing 737 ends up in serious trouble....

Cash long before." what knows what he will say? i assume he'll just, as michael said, say i'm a businessman and i understand the economy. and i do think for any of the candidates actually, anyone who can show that they have some grasp of the business world and the economy, this will be a plus for them. >> this is a moment for them. you have carly fiorina, former ceo of hewlett packard. thank you very much, joanne and michael smerconish. i'm poppy harlow in new york. thank you for being with me as we watch the selloff. dow down 427 points. an ugly day on wall street. where will it end? stay wit...

With all their might on a rudder pedal and all it's doing is driving them back. it keeps pushing back at them, it doesn't go forward. we've never had this report from a crew of a pedal back forcing against them. now we're into a different scenario. >> fortunately they were at a higher air speed than the 427 which gave them more control. they were able to successfully land the plane. >> after hearing the pilot's experience with the rudder pedals, investigators suspect a jam might be the problem in the airplane's rudder system. >> the pilots control the rudder on the 737 with pedals. those pedal...

With it effectively. >> it takes 4 1/2 years, one of the longest accident investigations in aviation history to solve the mystery of flight 427. with it investigators are able to bring closure to another cold case, united flight 585, the other boeing 737 that crashed three years earlier. >> the rudder system on the 737 fleet has been completely redesigned. it's a very different system now than it was at that time. there was a lot of changes also to flight crew training. more hands-on flying, being ready to recover from unusual upsets and unusual events. >> history's proven us to be right. ther...

U.s. air flight 427 smashes down outside of pittsburgh. it is the second boeing 737 in three years to suddenly roll for unknown reasons and then crash killing everyone on board. it's a mystery threatening to ground the most widely used jet in the world. investigators suspect a problem with the rudder, which controls the plane's movement to the left and right, but they find no evidence of a malfunction. nearly two years after the crash, a possible break in the case. the pilot of an eastwind airlines boeing 737 experiences a sudden roll as the jet approaches richmond, virginia. >> he quickly got...