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NTSB Report
September 6, 2019 · Robinson R44 II · N447PA
Nuiqsut, AK
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
September 6, 2019
Injury Outcomes
No injuries (1 uninjured)
Location
Nuiqsut, AK
Aircraft
Robinson R44 II (2006)
Tail Number
N447PA
Operator
Pollux Aviation
Injuries
None
Aircraft Damage
Substantial
NTSB Number
GAA19CA531
The pilot reported that he landed the helicopter facing south and about 90 ft from where ground personnel were unhooking super sacks filled with gravel. When the skids touched down, the pilot reduced the collective and then saw an empty super sack about 15 ft away, which subsequently struck the main rotor toward the outboard portion of the blade. The super sack was ingested by the advancing side of the main rotor disk. The pilot rolled off the throttle and shut down the engine. The helicopter sustained 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.
NTSB Probable Cause
The pilot's improper decision to land downwind from unsecured debris, which resulted in the helicopter’s main rotor disk ingesting foreign objects.
Full Narrative
The helicopter pilot reported that, he landed the helicopter facing south and about 30 yards from the empty gravel carrying super sacks. When the skids touched down, the pilot reduced the collective and saw a super sack about 15ft away and coming at the helicopter. The super sack was ingested by the advancing side of the main rotor disk. The pilot rolled off throttle and shut down the engine. The helicopter sustained substantial damage to the main rotor blades. The pilot reported that the wind at the accident site was from the southwest about 15 knots. The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
Flight
Event TypeAccident
Event Time13:50 AKDT
Nearest AirportNUIQSUT (444nm SW)
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson R44 II
Tail NumberN447PA
Aircraft CategoryHeli
DamageSubstantial
OperatorPollux Aviation
Operating RulePart 133
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-540-AE1A5 · Reciprocating · 260
Seats4
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 32 · Second Class · None
Conditions
ConditionsVMC
LightDaylight
Wind220° @ 7 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point43 C
Altimeter30.09 inHg
Observation Time21:55
Weather SourceWFAC