Accident
Last updated: 29 July 2014
Status:Schlussbericht
Datum:Freitag 8 Dezember 1972
Zeit:14:28
Flugzeugtyp:Silhouette image of generic B732 model; specific model in this crash may look slightly different
Boeing 737-222
Fluggesellschaft:United Air Lines
Kennzeichen: N9031U
Werknummer: 19069/75
Baujahr: 1968-09-24 (4 years 3 months)
Betriebsstunden:7247
Triebwerk: 2 Pratt & Whitney JT8D-7B
Besatzung:Todesopfer: 3 / Insassen: 6
Fluggäste:Todesopfer: 40 / Insassen: 55
Gesamt:Todesopfer: 43 / Insassen: 61
Opfer am Boden:Todesopfer: 2
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:2 km (1.3 Meilen) von Chicago-Midway, IL (   USA) show on map
Flugphase: Annäherung (APR)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Washington-National Airport, DC (DCA/KDCA), USA
Flug nach:Chicago-Midway Airport, IL (MDW/KMDW), USA
Flugnummer: 553
Unfallbericht:
The aircraft, named "City of Lincoln", took off from Washington-National Airport for flight UA553 to Chicago and Omaha. Departure time was 12:50 CST. Chicago ARTCC cleared the crew to descend to 4000 feet and the flight was given vectors for a Midway Airport runway 31L localizer course. At 14:19 the flight was transferred to Chicago Approach Control which later requested UA553 to slow down to 180 knots and later down to 160 knots. After issuing a descent clearance down to 2000 feet at 14:23 the controller requested the flight to slow down to approach speed because of separation between UA553 and a preceding Aero Commander. At 14:24 the Aero Commander passed the Outer Marker and was cleared to land on runway 31L. Two minutes later UA553 passed the Outer Marker inbound. Then, at 14:27:04 the air traffic controller decided to issue a missed approach clearance: "United 553 execute a missed approach make a left turn to a heading of 180 climb to 2000". At the same time, having just reached 1000 feet, the stick shaker suddenly activated. Full power was applied and the gear was retracted in an attempt to execute a missed approach. The Boeing continued to descend however, attaining a high nose up attitude (of at least 30deg, according to some survivors). The aircraft then clipped a tree and impacted trees, houses, utility pole cables and garages before coming to rest. Post crash fire destroyed part of the fuselage.

PROBABLE CAUSE: "The captain's failure to exercise positive flight management during the execution of a non-precision approach, which culminated in a critical deterioration of airspeed into the stall regime where level flight could no longer be maintained."

Informationsquelle:
» NTSB-AAR-73-16

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - USA
report status: Final
report number: NTSB/AAR-73-16
report released:29-AUG-1973
duration of investigation:264 days (8.8 months)
download report: United Air Lines, Inc., B-737, N9031U, Chicago-Midway Airport, Chicago, Illinois, December 8, 1972. (NTSB/AAR-73-16)
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Sicherheitsempfehlungen

NTSB issued 2 Safety Recommendations

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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Washington-National Airport, DC to Chicago-Midway Airport, IL as the crow flies is 958 km (599 miles).

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