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Last updated: 17 October 2021
Date:Tuesday 8 October 1946
Type:Silhouette image of generic DC4 model; specific model in this crash may look slightly different
Douglas DC-4
Operator:United Airlines
Registration: NC30051
MSN: 10471
First flight: 1944
Total airframe hrs:3077
Engines: 4 Pratt & Whitney R-2000-11
Crew:Fatalities: 0 / Occupants: 4
Passengers:Fatalities: 2 / Occupants: 37
Total:Fatalities: 2 / Occupants: 41
Aircraft damage: Damaged beyond repair
Location:2,4 km (1.5 mls) NW of Cheyenne Airport, WY (CYS) (   United States of America)
Phase: Approach (APR)
Nature:Domestic Scheduled Passenger
Departure airport:San Francisco Municipal Airport, CA (SFO/KSFO), United States of America
Destination airport:Cheyenne Airport, WY (CYS/KCYS), United States of America
Flightnumber: 28
At least two attempts to land had failed as the aircraft approached too high in minimum ceiling conditions. The pilot tried to maneuver the aircraft to another runway at a low altitude. The wing struck the ground and the DC-4 skidded for 700 feet. The aircraft was named "Mainliner Lake Michigan".

Probable Cause:

PROBABLE CAUSE: "The Board determines that the probable cause of this accident was a loss of altitude during a turn preparatory to a final approach while the pilot was manoeuvring in an attempt to land."

Controlled Flight Into Terrain (CFIT) - Ground

» CAB File No. 4048-46


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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from San Francisco Municipal Airport, CA to Cheyenne Airport, WY as the crow flies is 1546 km (966 miles).
Accident location: Approximate; accuracy within a few kilometers.

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