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Last updated: 4 December 2021
Statuts:Enquête Officielle
Date:dimanche 16 septembre 1951
Heure:10:47
Type/Sous-type:Silhouette image of generic C46 model; specific model in this crash may look slightly different
Curtiss C-46D-10-CU Commando
Compagnie:Peninsular Air Transport
Immatriculation: N74689
Numéro de série: 32975
Année de Fabrication: 1944
Heures de vol:5754
Moteurs: 2 Pratt & Whitney R-2800-75
Equipage:victimes: 0 / à bord: 4
Passagers:victimes: 0 / à bord: 49
Total:victimes: 0 / à bord: 53
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Chicago-Midway Airport, IL (MDW) (   Etats-Unis d'Amérique)
Phase de vol: En montée initiale (ICL)
Nature:Transport de Passagers Nat.
Aéroport de départ:Chicago-Midway Airport, IL (MDW/KMDW), Etats-Unis d'Amérique
Aéroport de destination:Covington-Greater Cincinnati Airport, KY (CVG/KCVG), Etats-Unis d'Amérique
Numéro de vol: 108
Détails:
The day before the accident the aircraft was flown from Miami, Florida, to Chicago, with stops at St. Petersburg and Covington. On the leg between Covington and Chicago, malfunctioning of the left engine was experienced. This trouble manifested itself by intermittent misfiring, and was corrected by the use of full-rich mixture. At Chicago the aircraft was refueled late in the evening of the same day, September 15, and maintenance work on the left engine was performed by Butler aviation personnel on the following morning. The flight was to be over the reverse route and with the same stops as had been made on the previous day. The aircraft was cleared to take off on runway 31L. According to the weight and balance manifest, the takeoff weight was the maximum allowable (45,000 pounds). However, in fact the authorized gross weight was exceeded by approximately 1,960 pounds. The C-46 became airborne at a speed of about 100 or 105 mph, and simultaneously the left engine started misfiring. The landing gear was raised. Then the left engine started backfiring. The captain placed the left mixture control in the full-rich position. The did not stop the misfiring, and he then turned off the left engine's right magneto. The engine continued to fire erratically, the captain put the magneto switch back on both magnetos, the engine then lost all power, and its propeller was feathered. The aircraft started a slight turn to the left. The aircraft climbed slowly on its right engine to an attitude estimated at from 150 to 200 feet. The aircraft continued to turn gradually to the left and altitude was being lost. Ahead the captain saw a sizable stretch of open land and decided to crash land. He cut the power on the right engine, nosed the aircraft down, quickly flared it out, and landed exceptionally hard with landing gear and flaps retracted. The severity of contact broke both engines completely free of their mounts. The aircraft rode over both engines, bounced several times and slid to a stop.

Probable Cause:

PROBABLE CAUSE: "The Board determines that the probable cause of this accident was the poor technique used by the pilot in taking off at too low an air speed to maintain single engine flight, followed by a critical loss of power from the left engine, and subsequently a partial loss of power from the right engine, conditions which were aggravated by the effects of the overload."

Sources:
» CAB


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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 Covington-Greater Cincinnati Airport, KY est de 399 km (249 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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