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NTSB Report
December 3, 1990 · Aerospatiale SA316B · N316BS
Vernal, UT
Overview
Report Status
Probable Cause
Event Type
Accident
Date
December 3, 1990
Injury Outcomes
3 injuries (3 minor injuries)
Location
Vernal, UT
Aircraft
Aerospatiale SA316B
Tail Number
N316BS
Operator
Avman Aviation Helicopter Svc
Injuries
Minor
Aircraft Damage
Destroyed
NTSB Number
SEA91LA028
THE ACFT DEVELOPED VIBRATIONS IN FLT WITH SEVERE FEEDBACK THROUGH THE CONTROL SYSTEM TO THE CYCLIC STICK. THE PILOT INITIATED AN EMERGENCY LANDING AND LOST CONTROL JUST BEFORE TOUCHDOWN. THE ACFT IMPACTED THE GROUND WHILE SPINNING AND ROLLED OVER. EVIDENCE INDICATED A MALFUNCTION/FAILURE OF A MAIN ROTOR DAMPER.
NTSB Probable Cause
A MALFUNCTION/FAILURE OF THE HELICOPTER'S MAIN ROTOR LEAD-LAG DAMPER.
Full Narrative
THE ACFT DEVELOPED VIBRATIONS IN FLT WITH SEVERE FEEDBACK THROUGH THE CONTROL SYSTEM TO THE CYCLIC STICK. THE PILOT INITIATED AN EMERGENCY LANDING AND LOST CONTROL JUST BEFORE TOUCHDOWN. THE ACFT IMPACTED THE GROUND WHILE SPINNING AND ROLLED OVER. EVIDENCE INDICATED A MALFUNCTION/FAILURE OF A MAIN ROTOR DAMPER.
Flight
Event TypeAccident
Event Time14:45 MST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAerospatiale SA316B
Tail NumberN316BS
Aircraft CategoryHeli
DamageDestroyed
OperatorAvman Aviation Helicopter Svc
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsTurbomeca · ARTOUSTE III · Turboshaft · 858
Seats7
People & Injuries
Injury Summary3 injuries (3 minor injuries)
Fatal0
Serious0
Minor3
Uninjured0
Total3
Crew 1Age 47 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility40 sm
CeilingNone
Temperature / Dew Point34 C / 28 C
Altimeter30.00 inHg
Observation Time21:50
Weather SourceWFAC