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NTSB Report
September 12, 1983 · Hughes 369D · N8667F
Woodruff, UT
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 12, 1983
Injury Outcomes
1 injury (1 minor injury)
Location
Woodruff, UT
Aircraft
Hughes 369D
Tail Number
N8667F
Operator
Rocky Mountain Helicopters
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
DEN83FA215
THE HELICOPTER WAS BEING USED TO LIFT SEISMIC MATERIALS ON A 100 FT LONG LINE. AFTER LIFTING THE LOAD TO A HOVER AT ABOUT 10 TO 20 FT, THE PLT HEARD A LOUD 'BANG' WHICH WAS FOLLOWED BY A LOSS OF DIRECTIONAL CONTROL. THE HELICOPTER BEGAN UNCONTROLLED SPINNING & CRASHED MOMENTS LATER. WITNESSES REPORTED THAT THE TAIL ROTOR BLADES STOPPED ROTATING PRIOR TO THE HELICOPTER HITING THE GROUND. AN EXAM REVEALED THAT THE AFT TAIL ROTOR DRIVESHAFT FLEXIBLE COUPLING, BENDIX PN; 369A5501, HAD FAILED. DUE TO DAMAGE OF THE FRACTURE SURFACE, THE MODE OF FAILURE COULD NOT BE DETERMINED.
Full Narrative
THE HELICOPTER WAS BEING USED TO LIFT SEISMIC MATERIALS ON A 100 FT LONG LINE. AFTER LIFTING THE LOAD TO A HOVER AT ABOUT 10 TO 20 FT, THE PLT HEARD A LOUD 'BANG' WHICH WAS FOLLOWED BY A LOSS OF DIRECTIONAL CONTROL. THE HELICOPTER BEGAN UNCONTROLLED SPINNING & CRASHED MOMENTS LATER. WITNESSES REPORTED THAT THE TAIL ROTOR BLADES STOPPED ROTATING PRIOR TO THE HELICOPTER HITING THE GROUND. AN EXAM REVEALED THAT THE AFT TAIL ROTOR DRIVESHAFT FLEXIBLE COUPLING, BENDIX PN; 369A5501, HAD FAILED. DUE TO DAMAGE OF THE FRACTURE SURFACE, THE MODE OF FAILURE COULD NOT BE DETERMINED.
Flight
Event TypeAccident
Event Time10:20 MDT
Nearest Airport5nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369D
Tail NumberN8667F
Aircraft CategoryHeli
DamageSubstantial
OperatorRocky Mountain Helicopters
Operating RulePart 133
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 420
Seats4
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 48 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind3 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter0
Weather SourcePILO