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Last updated: 6 December 2021
Statuts:Enquête Officielle
Date:jeudi 29 décembre 1955
Type/Sous-type:Silhouette image of generic L18 model; specific model in this crash may look slightly different
Lockheed 18-56-23 Lodestar
Compagnie:Gulf Oil Corporation
Immatriculation: N33366
Numéro de série: 18-2387
Année de Fabrication: 1943
Moteurs: 2 Wright R-1820-72
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 0 / à bord: 0
Total:victimes: 2 / à bord: 2
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:7,5 km (4.7 milles) NW of Londonderry, OH (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Aéroport de départ:Tulsa International Airport, OK (TUL/KTUL), Etats-Unis d'Amérique
Aéroport de destination:Pittsburgh International Airport, PA (PIT/KPIT), Etats-Unis d'Amérique
The flight departed Tulsa at 18:10 CST and routine position reports were made until over Dayton, Ohio, at 12:00. Over Dayton the aircraft entered icing conditions at the cruise altitude of 9000 feet. The crew requested permission twice to descend to a lower altitude to evade the icing conditions, but these requests were turned down. Around 12:35 the pilot reported "Difficulty maintaining altitude and airspeed request lower altitude." At 12:37 Columbus CAA cleared the flight to descend to 8,000 feet msl. At approximately 12:40 witnesses observed the aircraft below the overcast; it was on a westerly heading and was descending although it appeared to be in a normal attitude. Several components were seen to separate from the aircraft before it struck the ground in a steep angle.

Probable Cause:

PROBABLE CAUSE: "The Board determines that the probable cause of this accident was the accumulation of enough ice to result in loss of control and the subsequent shedding of vertical surfaces from the tail group of the aircraft."

» CAB File No. 2-0061


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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 Tulsa International Airport, OK et Pittsburgh International Airport, PA est de 1434 km (896 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 tel qu'ils sont connus à ce jour.
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