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NTSB Report
July 24, 2017 · Bell 47G 3B 3B · N47AH
Toterville, IA
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
July 24, 2017
Injury Outcomes
No injuries (1 uninjured)
Location
Toterville, IA
Aircraft
Bell 47G 3B 3B (1961)
Tail Number
N47AH
Operator
Scotts Helicopter Service
Injuries
None
Aircraft Damage
Substantial
NTSB Number
GAA17CA436
According to the helicopter pilot, during an agricultural flight, he made a downwind turn to spray the intended field. During the low airspeed right turn, he increased the engine power, and the rotor rpm decreased. He reported that he leveled the helicopter to clear power lines, but the rotor rpm remained low. The helicopter descended, and the pilot landed the helicopter in a corn field. The helicopter sustained substantial damage to the tailboom and horizontal stabilizer. The nearest METAR located 15 nautical miles south-southeast from the accident site reported that, about the time of the accident, the wind was calm. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
NTSB Probable Cause
Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Prop/rotor parameters-Not attained/maintained - C
Full Narrative
According to the helicopter pilot, during an agricultural flight, he made a downwind turn to spray the intended field. During the low airspeed right turn, he increased the engine power and the rotor RPM decreased. He reported that he leveled the helicopter to clear powerline wires, but the rotor RPM remained low. The helicopter descended, and the pilot landed the helicopter in a corn field. The helicopter sustained substantial damage to the tailboom and the horizontal stabilizer. The nearest METAR was 15 nautical miles south-southeast and reported that about the time of the accident, the wind was calm. The pilot reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
Flight
Event TypeAccident
Event Time16:00 CDT
Nearest Airport0nm
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 47G 3B 3B
Tail NumberN47AH
Aircraft CategoryHeli
DamageSubstantial
OperatorScotts Helicopter Service
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · TV0-435 SER · Reciprocating · 250
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 33 · Second Class · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility7 sm
CeilingNone
Temperature / Dew Point57 / 55
Altimeter30.03 inHg
Observation Time08:14
Weather SourceWFAC