Narrative:Rolled rapidly to the inverted position and descend almost vertically into the ground while on approach to Billings' runway 27R. Upset caused by wake turbulence from a preceding Boeing 757. Horizontal separation was decreasing below 2.6 miles.
Probable Cause:
PROBABLE CAUSE: "The pilot-in-command's failure to follow established vortex avoidance procedures, as published in the airman's information manual, to provide his own wake turbulence separation."
Accident investigation:
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Investigating agency: | NTSB  |
Status: | Investigation completed |
Duration: | 1 years | Accident number: | SEA93GA041 | Download report: | Summary report
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Classification:
Weather: Wake vortex encounter
Loss of control
Sources:
» NTSB
Photos
Map
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 Watertown Airport, SD to Billings-Logan International Airport, MT as the crow flies is 888 km (555 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.