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NTSB Report
September 7, 2021 · Mcdonnell Douglas Helicopter 369E · N125KW
Delta Junction, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 7, 2021
Injury Outcomes
1 injury (1 minor injury), 1 uninjured
Location
Delta Junction, AK
Aircraft
Mcdonnell Douglas Helicopter 369E (1989)
Tail Number
N125KW
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ANC21LA083
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.
NTSB Probable Cause
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.
Full Narrative
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.
Flight
Event TypeAccident
Event Time17:40 AKDT
Nearest Airport0nm
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMcdonnell Douglas Helicopter 369E
Tail NumberN125KW
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsRolls-Royce · 250-C20B · Turboshaft · 420
Seats4
People & Injuries
Injury Summary1 injury (1 minor injury), 1 uninjured
Fatal0
Serious0
Minor1
Uninjured1
Total2
Crew 1Age 24 · First Class · None
Conditions
ConditionsVMC
LightDaylight
Wind90° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point48 F / 37 F
Altimeter29.96 inHg
Observation Time17:53
Weather SourceWFAC