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ASN Wikibase Occurrence # 198778
Last updated: 15 September 2021
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Type:Silhouette image of generic BK17 model; specific model in this crash may look slightly different
Eurocopter MBB BK 117C-2
Owner/operator:Air Methods Corp
Registration: N145HN
MSN: 9302
Fatalities:Fatalities: 0 / Occupants: 5
Other fatalities:0
Aircraft damage: Substantial
Location:Pittsburgh, PA -   United States of America
Phase: Unknown
Departure airport:Grafton, WV (22WV)
Destination airport:Pittsburgh, PA (PN80)
The accident flight, which was an on-demand air medical flight, was the second flight of the day following maintenance work that had been performed on the helicopter earlier that morning. The commercial pilot reported that the flight was uneventful but that, after landing, he noticed that the left vertical fin cowling had partially separated and contacted a tail rotor blade. Further examination of the helicopter revealed that the right vertical fin cowling remained secured but that 8 of the 11 fasteners on the left vertical fin cowling were unlocked, consistent with maintenance personnel not properly securing them following the maintenance work that was performed earlier that day.
Probable Cause: Maintenance personnelís failure to properly secure the left vertical fin cowling during recent maintenance, which resulted in its separation and subsequent contact with the tail rotor system during flight.



Accident investigation:
Investigating agency: 
Status: Investigation completed
Download report: Final report

Revision history:

19-Aug-2017 15:08 ASN Update Bot Added
09-Sep-2017 10:44 TB Updated [Aircraft type, Operator, Other fatalities, Nature, Source]
24-Dec-2017 15:13 Aerossurance Updated [Operator]

Corrections or additions? ... Edit this accident description