Accident
Last updated: 20 October 2014
Statuts:Enquête Officielle
Date:vendredi 24 août 1951
Heure:04:28
Type/Sous-type:Silhouette image of generic DC6 model; specific model in this crash may look slightly different
Douglas DC-6B
Compagnie:United Air Lines
Immatriculation: N37550
Numéro de série: 43260/180
Année de Fabrication: 1951
Heures de vol:361
Moteurs: 4 Pratt & Whitney R-2800-CB16
Equipage:victimes: 6 / à bord: 6
Passagers:victimes: 44 / à bord: 44
Total:victimes: 50 / à bord: 50
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:22 km (13.8 milles) SW of Oakland International Airport, CA (OAK) (   Etats-Unis d'Amérique) show on map
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Chicago (unknown airport), IL, Etats-Unis d'Amérique
Aéroport de destination:Oakland International Airport, CA (OAK/KOAK), Etats-Unis d'Amérique
Numéro de vol: 615
Détails:
United Flight 615 departed Boston at 17:32 EST, made scheduled stops at Hartford, Connecticut, and Cleveland, Ohio, and arrived at Chicago, Illinois, at 21:59 CST. The flight departed Chicago at 22:59 CST. At 03:54, while approaching the Oakland area, Flight 615 was cleared to the Newark, California fan marker, with instructions to descend to 6,000 feet, maintain that altitude, and contact Oakland Approach Control over Altamont. At 04:11, the flight reported over Stockton, California, at 9,500 feet, descending. Five minutes later they were over the Altamont Intersection. The flight was cleared by Approach Control to the Oakland radio range station to maintain at least 500 feet above the tops of the clouds. The pilot followed this contact with a request for clearance direct to Newark and a straight-in range approach. This request was granted, with instructions to maintain an altitude of 500 feet on top of the cloud layer between Altamont and Newark. At 04:25 Flight 615 was cleared for a straight-in approach on the southeast course of the Oakland radio range from Newark. At 04:27 the flight reported leaving Newark inbound to Oakland. This was the last radio contact. The aircraft descended until it struck rising mountainous terrain at 983 feet MSL, 26 feet below the crest of the hill and approximately three miles to the right of the southeast on-course signal of the Oakland radio range. The major portion of the structure hurtled over the top of the knoll, scattering on the down-slope and into a canyon beyond. The captain was possibly using the ADF, allowing the DC-6 to be 3 miles to the right of the intended course and about 2500 feet below the 3500 feet minimum altitude. Cloud base was at 1500 feet with patches of fog obscuring terrain.

PROBABLE CAUSE: "The failure of the captain to adhere to instrument procedures in the Newark area during an approach to the Oakland Municipal Airport."

Sources:
» Aviation Disasters / D. Gero
» CAB File No. 1-0058


Opérations de secours
United Air Lines required crews to operate under IFR when above an overcast.

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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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