Full FAA Chronology at this link.
19570805: The Civil Aeronautics Board adopted a rule requiring an approved Flight Data Recorder (FDR) aboard air carrier and commercial airplanes of more than 12,500 pounds maximum certificated takeoff weight, with compliance by July 15, 1958. The FDRs were to be capable of recording time, air speed, altitude, vertical acceleration, and heading. In adopting the rule, CAB stated that FDRs would be invaluable in investigating accidents and such incidents as extreme vertical accelerations. (At first, the rule applied only to aircraft certificated for operations above 25,000 feet, but this limitation was dropped in an amendment issued on July 12, 1960.)
This Day in FAA History: August 5th
