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NTSB Report
June 11, 1991 · Bell 47G3B1 · N73284
Lasalle, MN
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 11, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Lasalle, MN
Aircraft
Bell 47G3B1
Tail Number
N73284
Operator
Tery Jon Aviation
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI91DER05
THE PILOT STATED THAT HE WAS PERFORMING AERIAL APPLICATION OPERATIONS OVER A WHEAT FIELD WHEN THE ACCIDENT OCCURRED. HE WAS FLYING HIS FIRST SPRAY SWATH ON THE FIELD WHEN THE SPRAY BOOM CONTACTED THE CROP. THE HELICOPTER IMPACTED THE GROUND AND CAME TO REST INVERTED. THE PILOT'S RECOMMENDATION WAS TO FLY HIS SPRAY SWATHS AT A HIGHER ALTITUDE.
NTSB Probable Cause
THE PILOT'S FAILURE TO MAINTAIN ADEQUATE CLEARANCE FROM THE TERRAIN. A RELATED FACTOR IS THE PILOT'S MISJUDGED ALTITUDE ABOVE THE CROP.
Full Narrative
THE PILOT STATED THAT HE WAS PERFORMING AERIAL APPLICATION OPERATIONS OVER A WHEAT FIELD WHEN THE ACCIDENT OCCURRED. HE WAS FLYING HIS FIRST SPRAY SWATH ON THE FIELD WHEN THE SPRAY BOOM CONTACTED THE CROP. THE HELICOPTER IMPACTED THE GROUND AND CAME TO REST INVERTED. THE PILOT'S RECOMMENDATION WAS TO FLY HIS SPRAY SWATHS AT A HIGHER ALTITUDE.
Flight
Event TypeAccident
Event Time15:30 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G3B1
Tail NumberN73284
Aircraft CategoryHeli
DamageSubstantial
OperatorTery Jon Aviation
Operating RulePart 137
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20 · Turboshaft · 400
Seats3
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 30 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind170° @ 2 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO