CNN Around the World May 2, 2013 16:11:00
>> reporter: the 747 bound for dubai carrying equipment as part of the u.s. military's drawdown from afghanistan. the civilian cargo plane was loaded with five em rat each weighing about 20,000 pounds. >> securing them is absolutely critical to safety. >> reporter: the former director of the faa's accident investigation unit. he says there's no forgiveness in a plane's center of gravity. >> basically there can only be so much weight at each part of the plane. >> so it's critical that the total weight be within the limit and that the plane be balanced. >> reporter: the 747 can takeoff a couple ...