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Last updated: 29 March 2020
Statuts:Enquête Officielle
Date:mercredi 7 janvier 1953
Heure:04:12
Type/Sous-type:Silhouette image of generic C46 model; specific model in this crash may look slightly different
Curtiss C-46F-1-CU Commando
Compagnie:Associated Air Transport
Immatriculation: N1648M
Numéro de série: 22395
Année de Fabrication: 1945
Heures de vol:1941
Moteurs: 2 Pratt & Whitney R-2800
Equipage:victimes: 3 / à bord: 3
Passagers:victimes: 37 / à bord: 37
Total:victimes: 40 / à bord: 40
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:13 km (8.1 milles) W of Fish Haven, ID (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Charter National
Aéroport de départ:Seattle-Boeing Field International Airport, WA (BFI/KBFI), Etats-Unis d'Amérique
Aéroport de destination:Cheyenne Airport, WY (CYS/KCYS), Etats-Unis d'Amérique
Détails:
The Curtiss was chartered to fly military personnel from Seattle to Fort Jackson, SC. A scheduled stop was planned in Cheyenne. The flight departed Boeing Field at 00:50 and made the required position reports along the route, with no mention of any irregularities, reporting over Malad City at 13,000 feet, time 03:58, and estimating Rock Springs at 04:45. There were no further radio contacts with the aircraft. The C-46 started picking up some ice. It is likely that an involuntary descent was made into an area of increasing ice and turbulence which extended two or three thousand feet above the mountains. The mountains between Malad City and Bear Lake range from 8.000 feet to in excess of 9,000 feet. The westerly winds were lifting the moist unstable air over those mountains, producing zero ceilings, moderate to seven turbulence, moderate to heavy icing and snow, with updrafts on the windward side of the slopes and downdrafts on the leeward sides. The aircraft was unable to regain altitude until it struck a small pine tree at an altitude of approximately 8,545 feet. It struck several other pine trees and began to disintegrate as it continued down the slope at an approximate 50-degree angle shearing numerous trees. Contact with the ground was made at the base of the hill at the north end of a 93-foot ravine where the aircraft gouged three large holes in the ground. The aircraft then continued up a 32-degree rise approximately 200 feet where the tail section came to rest. Five days later, on January 12, 1953, at 1320 hours, the wreckage was sighted from the air by a Civil Air Patrol pilot.

Probable Cause:

PROBABLE CAUSE: "The inadvertent descent into an area of turbulence and icing which resulted in the flight's inability to regain a safe altitude."

Sources:
» CAB File No. 1-0006
» ICAO Accident Digest Circular 39-AN/34 (21-24)


Photos

photo of Curtiss-C-46F-Commando-N1648M
accident date: 07-01-1953
type: Curtiss C-46F Commando
registration: N1648M
 

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 Seattle-Boeing Field International Airport, WA et Cheyenne Airport, WY est de 1545 km (966 miles).
Accident location: Approximate; accuracy within a few kilometers.

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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Curtiss C-46

  • 3341 built
  • 744ème loss
  • 148ème accident fatal
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 Etats-Unis d'Amérique
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