Accident Cessna 550 Citation II N6887Y, Friday 18 December 1992
ASN logo

Date:Friday 18 December 1992
Type:Silhouette image of generic C550 model; specific model in this crash may look slightly different    
Cessna 550 Citation II
Owner/operator:United States Department of Energy
Registration: N6887Y
MSN: 550-0293
Year of manufacture:1981
Total airframe hrs:5275 hours
Engine model:Pratt & Whitney Canada JT15D-4
Fatalities:Fatalities: 8 / Occupants: 8
Other fatalities:0
Aircraft damage: Destroyed, written off
Location:1,6 km E of Billings-Logan International Airport, MT (BIL) -   United States of America
Phase: Approach
Departure airport:Watertown Airport, SD (ATY/KATY)
Destination airport:Billings-Logan International Airport, MT (BIL/KBIL)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
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: "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:
Investigating agency: NTSB
Report number: SEA93GA041
Status: Investigation completed
Duration: 11 months
Download report: Final report




  • 59th worst accident in 1992
  • 2nd worst accident of this aircraft type
  • worst accident of this aircraft type at the time


Revision history:


The Aviation Safety Network is an exclusive service provided by:
Quick Links:

CONNECT WITH US: FSF on social media FSF Facebook FSF Twitter FSF Youtube FSF LinkedIn FSF Instagram

©2024 Flight Safety Foundation

1920 Ballenger Av, 4th Fl.
Alexandria, Virginia 22314