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NTSB Report
July 8, 1989 · Sikorsky S-58T · N6306
Susanville, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 8, 1989
Injury Outcomes
1 injury (1 minor injury)
Location
Susanville, CA
Aircraft
Sikorsky S-58T
Tail Number
N6306
Operator
Aris Helicopters
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX89LA265
THE HELICOPTER ENTERED AN UNCOMMANDED LEFT YAW, IN AN AREA WITH SWIRLING WINDS, WHILE INBOUND FOR A FIRE SUPPRESSION WATER DROP. THE PILOT DUMPED THE WATER, RELEASED THE BUCKET COLLECTIVE PITCH AND ENTERED A DESCENT. HE WAS UNABLE TO STOP THE DESCENT DURING THE LANDING FLARE AND THE HELICOPTER COLLIDED WITH THE GROUND.
NTSB Probable Cause
THE PILOT'S INFLIGHT DECISION TO ENTER A DESCENT WHEN HE LOST YAW CONTROL OF THE AIRCRAFT. TURBULENT WEATHER CONDITIONS AND AN ABRUPT TOUCHDOWN WERE FACTORS IN THE ACCIDENT.
Full Narrative
THE HELICOPTER ENTERED AN UNCOMMANDED LEFT YAW, IN AN AREA WITH SWIRLING WINDS, WHILE INBOUND FOR A FIRE SUPPRESSION WATER DROP. THE PILOT DUMPED THE WATER, RELEASED THE BUCKET COLLECTIVE PITCH AND ENTERED A DESCENT. HE WAS UNABLE TO STOP THE DESCENT DURING THE LANDING FLARE AND THE HELICOPTER COLLIDED WITH THE GROUND.
Flight
Event TypeAccident
Event Time11:30 PDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSikorsky S-58T
Tail NumberN6306
Aircraft CategoryHeli
DamageSubstantial
OperatorAris Helicopters
Engines2
Engine TypeTurboshaft
Engine DetailsP&W · PT6T-6 · Turboshaft · 1600
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 41 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 5 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO