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NTSB Report
August 15, 1992 · Hiller UH12-E, Saloy Conver UH12-E, SA · N9753C
Arvin, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 15, 1992
Injury Outcomes
1 injury (1 minor injury)
Location
Arvin, CA
Aircraft
Hiller UH12-E, Saloy Conver UH12-E, SA
Tail Number
N9753C
Operator
San Joaquin Helicopters
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX92LA349
THE PILOT WAS CONDUCTING AN AERIAL APPLICATION FLIGHT. WHILE EXECUTING THE PROCEDURE TURNAROUND, THE MAIN ROTOR BLADE TENSION TORSION PIN FAILED DUE TO FATIGUE. THIS PART HAS A LIFE LIMIT OF 643 HOURS. THE FAILED PIN ACCRUED 641.5 HOURS. THE PILOT WAS ABLE TO EXECUTE AN AUTOROTATION, BUT WAS UNABLE TO FLARE WHICH RESULTED IN A HARD LANDING.
NTSB Probable Cause
THE FAILURE OF THE TENSION TORSION BAR PIN DUE TO FATIGUE. CONTRIBUTING TO THIS ACCIDENT WAS THAT IT WAS NOT POSSIBLE FOR THE PILOT TO FLARE THE HELICOPTER ON LANDING.
Full Narrative
THE PILOT WAS CONDUCTING AN AERIAL APPLICATION FLIGHT. WHILE EXECUTING THE PROCEDURE TURNAROUND, THE MAIN ROTOR BLADE TENSION TORSION PIN FAILED DUE TO FATIGUE. THIS PART HAS A LIFE LIMIT OF 643 HOURS. THE FAILED PIN ACCRUED 641.5 HOURS. THE PILOT WAS ABLE TO EXECUTE AN AUTOROTATION, BUT WAS UNABLE TO FLARE WHICH RESULTED IN A HARD LANDING.
Flight
Event TypeAccident
Event Time06:15 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHiller UH12-E, Saloy Conver UH12-E, SA
Tail NumberN9753C
Aircraft CategoryHeli
DamageSubstantial
OperatorSan Joaquin Helicopters
Operating RulePart 137
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 420
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 38 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility35 sm
CeilingNone
Temperature / Dew Point63 F
Altimeter29.00 inHg
Weather SourcePILO