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NTSB Report
December 8, 2022 · Hughes 369D · N458HW
La Sal, UT
Overview
Report Status
Probable Cause
Event Type
Accident
Date
December 8, 2022
Injury Outcomes
No injuries (2 uninjured)
Location
La Sal, UT
Aircraft
Hughes 369D (1979)
Tail Number
N458HW
Operator
Heliwild Investments
Injuries
None
Aircraft Damage
Substantial
NTSB Number
WPR23LA063
The pilot reported that, while the helicopter was in a stable hover against a mountain slope [toe-in landing], there was suddenly a “big bang”, and the helicopter began to descend and violently shuddered. He attempted to maneuver away from the slope, but the helicopter slid down the slope then came to rest on its left side. The pilot suspected a loose rock may have fell into the main rotor system or the main rotor blades contacted the slope. The helicopter sustained substantial damage to the fuselage, main rotor, and tail cone. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
NTSB Probable Cause
The pilot’s failure to maintain clearance from terrain during a toe-in landing to sloping terrain which resulted in a loss of helicopter control.
Full Narrative
The pilot reported that, while the helicopter was in a stable hover against a mountain slope [toe-in landing], there was suddenly a “big bang”, and the helicopter began to descend and violently shuddered. He attempted to maneuver away from the slope, but the helicopter slid down the slope then came to rest on its left side. The pilot suspected a loose rock may have fell into the main rotor system or the main rotor blades contacted the slope. The helicopter sustained substantial damage to the fuselage, main rotor, and tail cone. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
Flight
Event TypeAccident
Event Time04:15 MST
Nearest Airport0nm
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369D
Tail NumberN458HW
Aircraft CategoryHeli
DamageSubstantial
OperatorHeliwild Investments
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsRolls-Royce · Turboshaft
Seats3
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 31 · Second Class · None
Crew 2Age 34 · None · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point12 C / 23 C
Altimeter0
Observation Time11:15
Weather SourcePILO