The jetliner had been carrying five MRAP U.S. military vehicles, at least one of which broke loose after liftoff. The surprising revelations in the NTSB report are that the pilots knew of a faulty strap holding the vehicle, as well as the fact that cargo had shifted on a previous flight, but they decided to take off anyway.
According to the airplane's flight manual, it was not approved to carry five MRAPs. The NTSB said this was the first time National Airlines was called on to transport the mine-resistant, ambush-protected vehicles.
Another revelation was that the shifting MRAP slid backward and damaged the 747-400's hydraulic systems and horizontal stabilizer, rendering the airplane uncontrollable.
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