A flight data recorder is a crashworthy device that records data about an aircraft's flight, such as airspeed, heading, and the procedures of the pilot. It's also called a black box. Bill Hammack of the University of Illinios opens up a vintage black box from a Delta airlines jetliner.
He describes how the box withstands high temperatures and crash velocities. The flight data recorder he shows is a Sundstrand FA-542 and was used on a DC-9 in the 1970s.