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Last updated: 7 December 2021
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 Airlines
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: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:24 km (15 milles) SW of Oakland International Airport, CA (OAK) (   Etats-Unis d'Amérique)
Élévation des lieux de l'accident: 300 m (984 feet) amsl
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Chicago-Midway Airport, IL (MDW/KMDW), Etats-Unis d'Amérique
Aéroport de destination:Oakland International Airport, CA (OAK/KOAK), Etats-Unis d'Amérique
Numéro de vol:UA615
Détails:
United Flight 615, a Douglas DC-6 named "Mainliner Omaha", crashed near the top of a hill while approaching Oakland Airport, California for landing. All 50 on board were killed.
The aircraft operated on a scheduled service from Boston, Massachusetts to Oakland, California, with en route stops at Hartford, Connecticut; Cleveland, Ohio; and Chicago, Illinois. The first legs of the flight were uneventful and the aircraft arrived at Chicago at 21:59 CST. Following a crew change and refueling, the flight departed Chicago again at 22:59 CST.
At 03:54 PST, while approaching the Oakland area, Flight 615 was cleared to the Newark fan marker, with instructions to descend to 6000 feet, maintain that altitude, and contact Oakland Approach Control over Altamont. At 04:11, the flight reported over Stockton, California, at 9500 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 fuselage 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 three miles to the right of the intended course and about 2500 feet below the 3500 feet minimum altitude. The cloud base was at 1500 feet with patches of fog obscuring terrain.

Probable Cause:

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.

Photos

photo of Douglas-DC-6B-N37550
photo of Douglas-DC-6B-N37550
accident date: 24-08-1951
type: Douglas DC-6B
registration: N37550
 

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 Oakland International Airport, CA est de 2940 km (1838 miles).
Accident location: Exact; deduced from 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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Douglas DC-6

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