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NTSB Report
February 4, 1985 · Hughes 369D · N8306F
Taholah, WA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
February 4, 1985
Injury Outcomes
1 injury (1 minor injury)
Location
Taholah, WA
Aircraft
Hughes 369D
Tail Number
N8306F
Injuries
Minor
Aircraft Damage
Destroyed
NTSB Number
SEA85LA053
THE ACFT HAD LIFTED OFF DURING AN EXTERNAL LOAD OPERATION WHEN THE PLT FELT A 'VIBRATION/SHUDDER'. THE RIGHT SKID CONTACTED THE GROUND AND THE HELICOPTER ROLLED OVER DURING AN ATTEMPT TO MANEUVER THE HELICOPTER AWAY FROM GROUND PERSONNEL. INSPECTION REVEALED THE MAIN ROTOR DRIVE SHAFT SEPARATED APRX 3 INCHES FROM THE SPLINED END OF THE SHAFT. METALLURGICAL EXAMINATION DISCLOSED THE SHAFT FAILED FROM UNIDIRECTIONAL FATIGUE INITIATING FROM SURFACE PITS ON THE SHAFT.
Full Narrative
THE ACFT HAD LIFTED OFF DURING AN EXTERNAL LOAD OPERATION WHEN THE PLT FELT A 'VIBRATION/SHUDDER'. THE RIGHT SKID CONTACTED THE GROUND AND THE HELICOPTER ROLLED OVER DURING AN ATTEMPT TO MANEUVER THE HELICOPTER AWAY FROM GROUND PERSONNEL. INSPECTION REVEALED THE MAIN ROTOR DRIVE SHAFT SEPARATED APRX 3 INCHES FROM THE SPLINED END OF THE SHAFT. METALLURGICAL EXAMINATION DISCLOSED THE SHAFT FAILED FROM UNIDIRECTIONAL FATIGUE INITIATING FROM SURFACE PITS ON THE SHAFT.
Flight
Event TypeAccident
Event Time15:00 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369D
Tail NumberN8306F
Aircraft CategoryHeli
DamageDestroyed
Operating RulePart 133
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 375
Seats5
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 32 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind290° @ 2 kt
Visibility10 sm
CeilingOvercast 20000 ft
Temperature / Dew Point36 C / 19 C
Altimeter30.00 inHg
Observation Time22:45
Weather SourceWFAC