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NTSB Final Report: Delta Junction, Alaska

Location:

Delta Junction, Alaska

Accident Number:

ANC21LA083

Date & Time:

September 6, 2021, 17:40 Local

Registration:

N125KW

Aircraft:

McDonnell Douglas Helicopter 369E

Aircraft Damage:

Substantial

Defining Event:

Roll over

Injuries:

1 Minor, 1 None

Flight Conducted Under: Part 135: Air taxi & commuter - Scheduled

Analysis

The pilot was transporting personnel from a remote helipad that was constructed of a plastic, floating dock. She was unaware that the helicopter’s right skid had slid under a portion of the plastic dock. As she raised the collective to depart, she felt the helicopter roll to the right, and she attempted to correct the lateral rolling motion by lowering the collective. The helicopter continued to roll and came to rest on its right side. Subsequently, the helicopter sustained substantial damage to the main rotor system.

The pilot reported no preimpact 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 inability to maintain lateral control during the takeoff, which resulted in dynamic rollover. Contributing to the accident was the pilot’s decision to utilize an unsuitable landing area for flight operations.

Findings

Aircraft Personnel issues Personnel issues

Environmental issues

(general) - Not attained/maintained Aircraft control - Pilot

Decision making/judgment - Pilot

(general) - Ability to respond/compensate

Factual Information

History of Flight

Takeoff - Roll over (Defining event)

Takeoff - Collision during takeoff/land

Pilot Information

Certificate:

Airline transport; Flight instructor

Age:

24,Female

Airplane Rating(s):

None

Seat Occupied:

Left

Other Aircraft Rating(s):

Helicopter

Restraint Used:

4-point

Instrument Rating(s):

Helicopter

Second Pilot Present:

No

Instructor Rating(s):

Helicopter; Instrument helicopter

Toxicology Performed:

 

Medical Certification:

Class 1 Without waivers/limitations

Last FAA Medical Exam:

August 4, 2021

Occupational Pilot:

Yes

Last Flight Review or Equivalent:

July 25, 2021

Flight Time:

(Estimated) 1921 hours (Total, all aircraft), 25 hours (Total, this make and model), 1852 hours (Pilot In Command, all aircraft), 67 hours (Last 90 days, all aircraft), 16 hours (Last 30 days, all aircraft), 3 hours (Last 24 hours, all aircraft)

 Aircraft and Owner/Operator Information

Aircraft Make:

McDonnell Douglas Helicopter

Registration:

N125KW

Model/Series:

369E

Aircraft Category:

Helicopter

Year of Manufacture:

1989

Amateur Built:

 

Airworthiness Certificate:

Normal

Serial Number:

0336E

Landing Gear Type:

High skid; Skid

Seats:

4

Date/Type of Last Inspection:

September 5, 2021 100 hour

Certified Max Gross Wt.:

3000 lbs

Time Since Last Inspection:

 

Engines:

1 Turbo shaft

Airframe Total Time:

 

Engine Manufacturer:

ROLLS-ROYCE

ELT:

Installed, activated, did not aid in locating accident

Engine Model/Series:

250-C20B

Registered Owner:

 

Rated Power:

420 Horsepower

Operator:

On file

Operating Certificate(s) Held:

Rotorcraft external load (133), Commuter air

carrier (135), On-demand

air taxi (135)

Meteorological Information and Flight Plan

Conditions at Accident Site:

Visual (VMC)

Condition of Light:

Day

Observation Facility, Elevation:

PABI,1277 ft msl

Distance from Accident Site:

26 Nautical Miles

Observation Time:

17:53 Local

Direction from Accident Site:

270°

Lowest Cloud Condition:

Scattered / 2200 ft AGL

Visibility

10 miles

Lowest Ceiling:

Visibility (RVR):

 

Wind Speed/Gusts:

5 knots /

Turbulence Type Forecast/Actual:

None / None

Wind Direction:

90°

Turbulence Severity Forecast/Actual:

N/A / N/A

Altimeter Setting:

29.96 inches Hg

Temperature/Dew Point:

9°C / 3°C

Precipitation and Obscuration:

No Obscuration; No Precipitation

 

Departure Point:

Delta Junction, AK

Type of Flight Plan Filed:

None

Destination:

Delta Junction, AK

Type of Clearance:

None

Departure Time:

Type of Airspace:

Class G

Wreckage and Impact Information

Crew Injuries:

1 None

Aircraft Damage:

Substantial

Passenger Injuries:

1 Minor

Aircraft Fire:

None

Ground Injuries:

 

Aircraft Explosion:

None

Total Injuries:

1 Minor, 1 None

Latitude, Longitude:

63.999752,-144.73459(est)

Administrative Information

Investigator In Charge (IIC):

Swenson, Eric

 

Additional Participating Persons:

Brad Sipperley; FAA; Fairbanks, AK

 

Original Publish Date:

April 20, 2022                                                                   Investigation Class:

4

Note:

The NTSB did not travel to the scene of this accident.

 

Investigation Docket:

https://data.ntsb.gov/Docket?ProjectID=103817

 

 

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