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ASN Wikibase Occurrence # 138927
 
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Date:01-OCT-2011
Time:12:55
Type:Silhouette image of generic R66 model; specific model in this crash may look slightly different    
Robinson R66
Owner/operator:Private
Registration: N266CY
MSN: 0010
Fatalities:Fatalities: 1 / Occupants: 1
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:ca 1 mile S of Philip, SD -   United States of America
Phase: En route
Nature:Private
Departure airport:Gillette, WY (GCC)
Destination airport:Winner, SD (ICR)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The helicopter was on a cross-country flight when it experienced a separation of the main rotor mast 8 inches below the teeter bolt, and the main rotor blade assembly separated from the flying helicopter. Subsequently, the helicopter impacted terrain and a postimpact fire ensued. Examination of the mast revealed fracture features consistent with overload failure and mechanical damage indicative of mast bumping. An examination of the airframe, engine, and remaining systems revealed no preimpact anomalies. The reason for the mast bumping event could not be determined due to the amount of thermal damage to the wreckage.

Probable Cause: The in-flight separation of the main rotor mast following a mast bumping event. The reason for the mast bumping event could not be determined due to postaccident damage.

Sources:

NTSB
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=266CY

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 6 months
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
03-Oct-2011 15:33 RobertMB Added
03-Oct-2011 15:41 RobertMB Updated [Aircraft type, Operator, Narrative]
05-Oct-2011 11:22 aeronaut Updated [Source]
12-Oct-2011 02:07 Anon. Updated [Source]
17-Oct-2011 23:53 Geno Updated [Departure airport, Destination airport, Source, Narrative]
09-Mar-2013 11:58 TB Updated [Time, Aircraft type, Operator, Location, Departure airport, Destination airport, Source, Narrative]
09-Mar-2013 12:00 TB Updated [Source]
26-Feb-2016 20:22 Dr.John Smith Updated [Time, Location, Departure airport, Destination airport, Source, Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
19-Aug-2017 12:20 Aerossurance Updated [Time, Location, Source]
27-Nov-2017 17:19 ASN Update Bot Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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