Available parameters included altitude, indicated airspeed, heading, pitch attitude, roll attitude, stabiliser position, fan rotor speed (N1) for each engine, position of control surfaces and longitudinal, lateral and vertical acceleration. However, although the quality of the data recording was generally good, there were some anomalies in the data. The FDR was undamaged with no evidence of excessive damage and it was found to contain a full 25 hours of recorded data. The CVR data covered the final 33½ minutes of the flight beginning about 10 minutes after the number 2 engine failed. Both flight recorders were recovered from the wreckage. InvestigationĪn Investigation into the accident was carried out by the NTSB.
111 of the 296 occupants were killed, 47 sustained serious injuries, 125 sustained minor injuries and 13 were uninjured. Soon after the right main gear and wingtip contacted the only practicable (but officially closed) runway, the aircraft rolled inverted and was progressively destroyed by the impact and fire.
With the assistance of an off duty DC-10 Training Captain who managed to control the flight path by manipulating the thrust on engines 1 and 3, the aircraft was able to approach a runway at Sioux City on which an emergency landing was attempted. An emergency was declared and radar vectors to Sioux City offered by ATC and accepted.
It was soon clear that there had been a complete failure of hydraulic power, which resulted in the inability to operate any of the primary flight control surfaces. On 19 July 1989, a Douglas DC-10-10 (N1819U) being operated by United Airlines on a scheduled domestic passenger flight from Denver to Chicago O’Hare was in the cruise at F元70 in day VMC when about an hour after takeoff, a loud explosion was heard and it was apparent that the number 2 (tail-mounted) engine had failed.
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