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NTSB Report
November 8, 1991 · Bell 206B · N5736B
Salt Lake City, UT
Overview
Report Status
Probable Cause
Event Type
Accident
Date
November 8, 1991
Injury Outcomes
1 injury (1 fatality)
Location
Salt Lake City, UT
Aircraft
Bell 206B
Tail Number
N5736B
Operator
Classic Helicopter Service
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA92FA016
AT THE BEGINNING OF THE FLIGHT, THE HELICOPTER LIFTED OFF FROM THE PARKING RAMP AND IMMEDIATELY BEGAN SPINNING AS IT ASCENDED TO AN ALTITUDE OF APPROXIMATELY 200 FEET. WITNESSES REPORTED THAT AT THE PEAK OF THE CLIMB, THE RATE OF ROTATION SLOWED AND THE HELICOPTER BEGAN A RAPID DESCENT. PITCH ANGLE DIFFERENCES IN THE MAIN ROTOR BLADES, ALONG WITH A DECREASE IN THE MAIN ROTOR ROTATION, WERE NOTICED. THE HELICOPTER'S PITCH ANGLE (NOSE UP AND NOSE DOWN) WAS ERRATIC. JUST PRIOR TO IMPACT, THE HELICOPTER STABILIZED AND WAS NOT ROTATING WHEN IT IMPACTED ON THE RAMP A FEW HUNDRED YARDS FROM THE TAKEOFF POINT. THE HELICOPTER WAS ENGULFED IN FLAMES UPON IMPACT. SOME OF THE WITNESSES REPORTED THAT THE HELICOPTER WAS SPINNING TO THE LEFT, WHILE OTHERS REPORTED THAT IT WAS SPINNING TO THE RIGHT.
NTSB Probable Cause
THE PILOT FAILED TO MAINTAIN DIRECTIONAL CONTROL. FACTORS TO THE ACCIDENT WERE: INADEQAUTE REMEDIAL ACTION, OVER CONFIDENCE IN PERSONAL ABILITY, AND LACK OF RECENT EXPEREINCE.
Full Narrative
AT THE BEGINNING OF THE FLIGHT, THE HELICOPTER LIFTED OFF FROM THE PARKING RAMP AND IMMEDIATELY BEGAN SPINNING AS IT ASCENDED TO AN ALTITUDE OF APPROXIMATELY 200 FEET. WITNESSES REPORTED THAT AT THE PEAK OF THE CLIMB, THE RATE OF ROTATION SLOWED AND THE HELICOPTER BEGAN A RAPID DESCENT. PITCH ANGLE DIFFERENCES IN THE MAIN ROTOR BLADES, ALONG WITH A DECREASE IN THE MAIN ROTOR ROTATION, WERE NOTICED. THE HELICOPTER'S PITCH ANGLE (NOSE UP AND NOSE DOWN) WAS ERRATIC. JUST PRIOR TO IMPACT, THE HELICOPTER STABILIZED AND WAS NOT ROTATING WHEN IT IMPACTED ON THE RAMP A FEW HUNDRED YARDS FROM THE TAKEOFF POINT. THE HELICOPTER WAS ENGULFED IN FLAMES UPON IMPACT. SOME OF THE WITNESSES REPORTED THAT THE HELICOPTER WAS SPINNING TO THE LEFT, WHILE OTHERS REPORTED THAT IT WAS SPINNING TO THE RIGHT.
Flight
Event TypeAccident
Event Time11:10 MST
Nearest AirportSalt Lake City (0nm)
Runway0
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftBell 206B
Tail NumberN5736B
Aircraft CategoryHeli
DamageDestroyed
OperatorClassic Helicopter Service
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 420
Seats5
People & Injuries
Injury Summary1 injury (1 fatality)
Fatal1
Serious0
Minor0
Uninjured0
Total1
Crew 1Age 39 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind150° @ 6 kt
Visibility20 sm
CeilingOvercast 25000 ft
Temperature / Dew Point55 / 41 C
Altimeter30.00 inHg
Weather SourceWIT