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NTSB Final Report: Mokelumne Hills, CA

 

Location:

Mokelumne Hills, CA

Accident Number:

WPR20CA059

Date & Time:

01/04/2020, 1209 PST

Registration:

N92785

Aircraft:

Sud Aviation SE 3130 ALOUETTE II

Aircraft Damage:

Substantial

Defining Event:

Dynamic rollover

Injuries:

1 None

Flight Conducted Under:

Part 91: General Aviation - Personal

Analysis 

The pilot reported that, after about 20 minutes of flight in the helicopter, he returned to a private runway. The pilot descended the helicopter and began a hover-taxi from one end of the runway to the other. During the hover, the right skid contacted grass adjacent to the runway. The helicopter rolled over on its right ride, which resulted in substantial damage to the main rotor blades. The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
 

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be: The pilot's failure to maintain adequate clearance from terrain during a hover-taxi, which resulted in the helicopter's skid contacting grass and a subsequent dynamic roll-over. 

Findings

Personnel issues

Aircraft control - Pilot (Cause)

Monitoring environment - Pilot (Cause)

Environmental issues

Object/animal/substance - Effect on operation (Cause)

Factual Information

History of Flight

Taxi

Collision with terr/obj (non-CFIT)

Dynamic rollover (Defining event)

 

Pilot Information

Certificate:

Private

Age:

74, Male

Airplane Rating(s):

Single-engine Land

Seat Occupied:

Right

Other Aircraft Rating(s):

Helicopter

Restraint Used:

 

Instrument Rating(s):

None

Second Pilot Present:

No

Instructor Rating(s):

None

Toxicology Performed:

No

Medical Certification:

Class 3 With Waivers/Limitations

Last FAA Medical Exam:

01/12/2018

Occupational Pilot:

No

Last Flight Review or Equivalent:

12/12/2017

Flight Time:

(Estimated) 1291 hours (Total, all aircraft)

 

 

Aircraft and Owner/Operator Information

Aircraft Make:

Sud Aviation

Registration:

N92785

Model/Series:

SE 3130 ALOUETTE II No Series

Aircraft Category:

Helicopter

Year of Manufacture:

1958

Amateur Built:

No

Airworthiness Certificate:

Normal

Serial Number:

1236

Landing Gear Type:

Skid

Seats:

 

Date/Type of Last Inspection:

01/12/2018, Annual

Certified Max Gross Wt.:

2000 lbs

Time Since Last Inspection:

 

Engines:

 

Airframe Total Time:

 

Engine Manufacturer:

 

ELT:

Installed, activated

Engine Model/Series:

 

Registered Owner:

On file

Rated Power:

 

Operator:

On file

Operating Certificate(s) Held:

None

 

Meteorological Information and Flight Plan

Conditions at Accident Site:

Visual Conditions

Condition of Light:

Day

Observation Facility, Elevation:

KSCK, 27 ft msl

Distance from Accident Site:

34 Nautical Miles

Observation Time:

2155 UTC

Direction from Accident Site:

225°

Lowest Cloud Condition:

Scattered / 2200 ft agl

Visibility

10 Miles

Lowest Ceiling:

 

Visibility (RVR):

 

Wind Speed/Gusts:

11 knots /

Turbulence Type Forecast/Actual:

None / None

Wind Direction:

320°

Turbulence Severity Forecast/Actual:

N/A / N/A

Altimeter Setting:

30.35 inches Hg

Temperature/Dew Point:

16°C / 10°C

Precipitation and Obscuration:

No Obscuration; No Precipitation

Departure Point:

Mokelumne Hills, CA (PVT)

Type of Flight Plan Filed:

None

Destination:

Mokelumne Hills, CA (PVT)

Type of Clearance:

None

Departure Time:

 PST

Type of Airspace:

 

 

Airport Information

Airport:

Private (PVT)

Runway Surface Type:

 

Airport Elevation:

1500 ft

Runway Surface Condition:

Dry

Runway Used:

N/A

IFR Approach:

None

Runway Length/Width:

 

VFR Approach/Landing:

None

 

Wreckage and Impact Information

Crew Injuries:

1 None

Aircraft Damage:

Substantial

Passenger Injuries:

N/A

Aircraft Fire:

None

Ground Injuries:

N/A

Aircraft Explosion:

None

Total Injuries:

1 None

Latitude, Longitude:

38.295556, -120.720833


Administrative Information

Investigator In Charge (IIC):

Zoe Keliher

Report Date:

06/16/2020

Additional Participating Persons:

Kurt Gibbons; Federal Aviation Administration; Salt Lake City, UT

Publish Date:

06/16/2020

Note:

This accident report documents the factual circumstances of this accident as described to the NTSB.

Investigation Docket:

http://dms.ntsb.gov/pubdms/search/dockList.cfm?mKey=100778





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