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Last updated: 19 February 2020
Status:Definitief
Datum:woensdag 7 januari 1953
Tijd:04:12
Type:Silhouette image of generic C46 model; specific model in this crash may look slightly different
Curtiss C-46F-1-CU Commando
Luchtvaartmaatschappij:Associated Air Transport
Registratie: N1648M
Constructienummer: 22395
Bouwjaar: 1945
Aantal vlieguren:1941
Motoren: 2 Pratt & Whitney R-2800
Bemanning:slachtoffers: 3 / inzittenden: 3
Passagiers:slachtoffers: 37 / inzittenden: 37
Totaal:slachtoffers: 40 / inzittenden: 40
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:13 km (8.1 mijl) W of Fish Haven, ID (   Verenigde Staten)
Fase: Kruisvlucht (ENR)
Soort vlucht:Binnenlandse charter
Vliegveld van vertrek:Seattle-Boeing Field International Airport, WA (BFI/KBFI), Verenigde Staten
Vliegveld van aankomst:Cheyenne Airport, WY (CYS/KCYS), Verenigde Staten
Beschrijving:
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."

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


Foto's

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

Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Seattle-Boeing Field International Airport, WA en Cheyenne Airport, WY bedraagt 1545 km (966 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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Curtiss C-46

  • 3341 built
  • 744e ongeval
  • 148e dodelijk ongeval
  • 7e zwaarste ongeval (toen het plaatsvond)
  • 12e zwaarste ongeval (op dit moment)
» safety profile

 Verenigde Staten
  • 13e zwaarste ongeval (toen het plaatsvond)
  • 83e zwaarste ongeval (op dit moment)
» safety profile