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Accident
Last updated: 20 October 2017
Status:Schlussbericht
Datum:Sonntag 17 September 1961
Zeit:08:57
Flugzeugtyp:Silhouette image of generic L188 model; specific model in this crash may look slightly different
Lockheed L-188C Electra
Fluggesellschaft:Northwest Orient Airlines
Kennzeichen: N137US
Werknummer: 1142
Baujahr: 1961
Betriebsstunden:614
Triebwerk: 4 Allison 501-D13
Besatzung:Todesopfer: 5 / Insassen: 5
Fluggäste:Todesopfer: 32 / Insassen: 32
Gesamt:Todesopfer: 37 / Insassen: 37
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:ca 1,5 km S of Chicago-O'Hare International Airport, IL (ORD) (   USA)
Flugphase: Anfangssteigflug (ICL)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Chicago-O'Hare International Airport, IL (ORD/KORD), USA
Flug nach:Tampa International Airport, FL (TPA/KTPA), USA
Flugnummer: 706
Unfallbericht:
Lockheed Electra N137US operated on Northwest flight 706 from Milwaukee to Miami (MIA) with intermediate stops at Chicago, Tampa and Fort Lauderdale. After a crew change at Chicago the plane taxied to runway 14R at 08:55 and was cleared for takeoff. Between the 8,000 and the 9,000-foot runway marker the aircraft was observed to commence an apparently coordinated right turn with a slowly increasing rate of bank. When the bank angle was 30 to 45 degrees, the crew made a short, garbled transmission. Immediately thereafter, at a bank angle of 50 to 60 degrees, the aircraft began to lose altitude. The maximum altitude attained in the entire turn was 200 to 300 feet. The right wing struck powerlines adjacent to the Chicago Northwestern Railroad tracks, severing the lines at an angle of about 70 degrees from the horizontal. It then continued in a direction of about 271 degrees magnetic and, when in a bank of about 85 degrees and a nose-down attitude of about 10 degrees, the right wing of the aircraft struck the railroad embankment.
Continuing to roll about its longitudinal axis, the aircraft cartwheeled, the nose crashing into the ground 380 feet beyond the point of first impact, and landed right side up. It then slid tail first another 820 feet. The aircraft disintegrated throughout its path.

Probable Cause:

PROBABLE CAUSE: "Mechanical failure in the aileron primary control system due to an improper replacement of the aileron boost assembly, resulting in a loss of lateral control of the aircraft at an altitude too low to effect recovery."



Fotos

photo of Lockheed L-188C Electra N137US
photo of Lockheed L-188C Electra N137US
photo of Lockheed L-188C Electra N137US
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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 Chicago-O'Hare International Airport, IL to Tampa International Airport, FL as the crow flies is 1620 km (1012 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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Lockheed L-188

  • 222 built
  • 7th loss
  • 6th Fataler Unfall
  • 4th worst accident (Zu diesem Zeitpunkt)
  • 12th worst accident (Momentan)
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 USA
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  • 92nd worst accident (Momentan)
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