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Last updated: 6 March 2021
Statuts:Enquête Officielle
Date:jeudi 17 mars 1960
Heure:15:25
Type/Sous-type:Silhouette image of generic L188 model; specific model in this crash may look slightly different
Lockheed L-188C Electra
Compagnie:Northwest Orient Airlines
Immatriculation: N121US
Numéro de série: 1057
Année de Fabrication: 1959-07-01 (9 months)
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: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:9 km (5.6 milles) NE of Cannelton, IN (   Etats-Unis d'Amérique)
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:
Northwest Orient Airlines Flight 710, was a scheduled service from Minneapolis (MSP) to Chicago (MDW) and Miami (MIA).
The Lockheed L-188C Electra departed Minneapolis at 12:51 and arrived at Chicago-Midway Airport 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 took off from Midway Airport at 14:38.
At 15:13, Flight 710 reported over Scotland, Indiana, maintaining 18000 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:

PROBABLE CAUSE: "The Board determines that the 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. "

Accident investigation:
cover
Investigating agency: CAB
Status: Investigation completed
Duration: 1 year and 1 months
Accident number: Final report
Download report: Final report


Opérations de secours
The FAA requested Lockheed to conduct an engineering reevaluation of Electra model airplanes following two fatal accidents (Sept. 1959 and March 1960).
The program disclosed two discrepancies in the design of the airplane. One, significant loads imposed on the wing's intermediate ribs between the fuselage and outboard nacelles by shell distortion had not been included in the design loads. Two, the dynamic response of the outboard nacelles in turbulence was different from the design assumptions.
Lockheed redesigned the engine mounts, nacelles, and cowlings, and modified the wing to improve strength capabilities. No Electra accidents have resulted from whirl-mode flutter since.

FAA issued 2 Emergency Airworthiness Directives

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Photos

photo of Lockheed-L-188C-Electra-N121US
accident date: 17-03-1960
type: Lockheed L-188C Electra
registration: N121US
photo of Lockheed-L-188C-Electra-N121US
accident date: 17-03-1960
type: Lockheed L-188C Electra
registration: N121US
photo of Lockheed-L-188C-Electra-N121US
accident date: 17-03-1960
type: Lockheed L-188C Electra
registration: N121US
photo of Lockheed-L-188C-Electra-N121US
accident date: 17-03-1960
type: Lockheed L-188C Electra
registration: N121US
 

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée 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).
Accident location: Exact; as reported in the official accident report.

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 tel qu'ils sont connus à ce jour.
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Lockheed L-188

  • 222 built
  • 3ème loss
  • 3ème accident fatal
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 Etats-Unis d'Amérique
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