Accident
Last updated: 27 November 2014
Statuts:Enquête Officielle
Date:jeudi 17 mars 1960
Heure:15:25
Type/Sous-type:Lockheed L-188C Electra
Compagnie:Northwest Orient Airlines
Immatriculation: N121US
Numéro de série: 1057
Année de Fabrication: 1959
Heures de vol:1786
Moteurs: 4 Allison 501-D13
Equipage:victimes: 6 / à bord: 6
Passagers:victimes: 57 / à bord: 57
Total:victimes: 63 / à bord: 63
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:9 km (5.6 milles) NE of Cannelton, IN (   Etats-Unis d'Amérique) show on map
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Chicago-Midway Airport, IL (MDW/KMDW), Etats-Unis d'Amérique
Aéroport de destination:Miami International Airport, FL (MIA/KMIA), Etats-Unis d'Amérique
Numéro de vol: 710
Détails:
Electra N121US was operating on Northwest Flight 710 from Minneapolis (MSP) to Chicago (MDW) and Miami (MIA). The flight departed Minneapolis at 12:51 and arrived at Midway at 13:55. During the short time the aircraft was on the ground at Chicago, approximately 30 minutes, it was refueled and prepared for continuation of the flight to Miami. The flight departed Chicago at 14:38. At 14:45, the flight reported to the Indianapolis, Indiana, ARTC Center over Milford at 18,000 feet and estimating Scotland, Indiana, at 15:12. At 15:13, Flight 710 reported over Scotland maintaining 18,000 feet and estimating Bowling Green, Kentucky, at 15:35. This was the last radio contact with the flight.
At 15:25 the outboard engines and engine support structures, the complete right wing, and the outer portions of the left wing and ailerons separated in flight. The aircraft crashed out of control.


PROBABLE CAUSE: "The Board determines that tho probable cause of this accident was the separation of the right wing in flight due to flutter induced by oscillations of the outboard nacelles. Contributing factors were a reduced stiffness of the structure and the entry of the aircraft into an area of severe clear air turbulence. "

Sources:


Opérations de secours
Modifications to all Lockheed Electra aircraft which included nacelle-wing improvements.

Photos

photo of Lockheed L-188C Electra N121US
photo of Lockheed L-188C Electra N121US
photo of Lockheed L-188C Electra N121US
photo of Lockheed L-188C Electra N121US
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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Chicago-Midway Airport, IL et Miami International Airport, FL est de 1892 km (1183 miles).

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tels qui sont connus à ce jour.
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