CHI08CA254 · Bell 47G-3B
Bell 47G-3B · Accident: settling with power/vortex ring state during takeoff
From Kenyon, MN to an unrecorded destination
Event
- NTSB case
- CHI08CA254
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Bell 47G-3B
- Aircraft type
- Bell 47
- Category
- Helicopter
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N47AH
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Kenyon, MNTo not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 137: Agricultural
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Takeoff
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Settling with power/vortex ring state
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Personnel issues › Task performance
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The pilot reported he had flown the helicopter on several aerial application flights earlier in the day, and that the humidity had increased as the weather cleared. He stated that the initial takeoff was normal, but that when he was about 100 yards from the support truck, the rotor rpm began to decay, and the helicopter settled into a soybean field. The spray boom caught in the crop, and the helicopter pitched forward, which resulted in the main rotor blades contacting the ground. The aft section of the tail boom, including the tail rotor, separated from the helicopter. The pilot reported there was no mechanical malfunction/failure with the helicopter. He did report that he should have decreased his load due to the weather conditions.
Probable cause
The pilot's inadequate preflight planning which resulted in the helicopter settling with power.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CHI08CA254
- Event ID
- 20080902X01359
- Case number
- CHI08CA254
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status, coordinates. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 9eb8f6b1766f6deeb15e5afad51356cfece64c2bbb31111765643b8b71f9b79c; retrieved 2026-09-15T10:08:13.098Z.