Accident
Last updated: 24 November 2014
Status:Definitief
Datum:woensdag 19 juli 1989
Tijd:16:00
Type:McDonnell Douglas DC-10-10
Luchtvaartmaatschappij:United Airlines
Registratie: N1819U
Constructienummer: 46618/118
Bouwjaar: 1973
Aantal vlieguren:43401
Aantal vluchten:16997
Motoren: 3 General Electric CF6-6D
Bemanning:slachtoffers: 1 / inzittenden: 11
Passagiers:slachtoffers: 110 / inzittenden: 285
Totaal:slachtoffers: 111 / inzittenden: 296
Schade: Vernield
Gevolgen: Written off (damaged beyond repair)
Plaats:Sioux Gateway Airport, IA (SUX) (   Verenigde Staten) show on map
Fase: Landing (LDG)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Denver-Stapleton International Airport, CO (DEN/KDEN), Verenigde Staten
Vliegveld van aankomst:Chicago-O'Hare International Airport, IL (ORD/KORD), Verenigde Staten
Vluchtnummer: 232
Beschrijving:
United Flight 232 departed Denver at 14:09 CDT for a flight to Philadelphia. Cruising altitude was FL370. About 1 hour and 7 minutes after takeoff the crew heard a loud bang, followed by vibration and a shuddering of the airframe; the no. 2 engine had suffered an uncontained failure. It then appeared that the hydraulic pressure was zero. The DC-10 didn't respond anymore to flight control inputs and the descending right turn was arrested by using no. 1 engine power reduction. The air driven generator (ADG), which powers the no. 1 auxiliary hydraulic pump, was deployed but hydraulic power couldn't be restored. An emergency was declared at 15:20, and vectors to Sioux City were given by Minneapolis ARTCC. An off-duty training check airman was travelling on Flight 232 and offered his assistance. He was asked to manipulate the throttles to control pitch and roll, which was difficult because the plane had a continuous tendency to turn to the right The no. 1 and 3 thrust levers couldn't be used symmetrically, so he used two hands to manipulate the throttles. Sioux City Airport was sighted at 9 miles out, but the aircraft was aligned with the closed runway 22 (6600 feet long) instead of the longer (8999 feet) runway 31. Given the position and the difficulty in making left turns, the approach to runway 22 was continued. The aircraft approached with a high sink rate (1620 feet/min for the last 20 seconds) at an airspeed of 215 knots. At about 100 feet above the ground the nose began to pitch downward and the right wing dropped. The plane touched down on the threshold slightly left of the centreline, skidded to the right and rolled inverted. The DC-10 caught fire and cartwheeled.

PROBABLE CAUSE: "The National Transportation Safety Board determines that the probable cause of this accident was the inadequate consideration given to human factors limitations in the inspection and quality control procedures used by United Airlines' engine overhaul facility which resulted in the failure to detect a fatigue crack originating from a previously undetected metallurgical defect located in a critical area of the stage 1 fan disk that was manufactured by General Electric Aircraft Engines. The subsequent catastrophic disintegration of the disk resulted in the liberation of debris in a pattern of distribution and with energy levels that exceeded the level of protection provided by design features of the hydraulic systems that operate the DC-10's flight controls."

Bronnen:
» Aviation Week & Space Technology 24.7.89 (96,97), 31.7.89(30-31)
» NTSB/AAR-90/06

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-90-06
report released:01-NOV-1990
duration of investigation:470 days (1 year 3.5 months)
download report: United Airlines Flight 232 McDonnell Douglas DC-10-10 Sioux Gateway Airport, Sioux City, Iowa, July 19, 1989 (NTSB/AAR-90-06)

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NTSB issued 25 Safety Recommendations

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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Denver-Stapleton International Airport, CO en Chicago-O'Hare International Airport, IL bedraagt 1436 km (897 miles).

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DC-10

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