DEN07LA155 · Bell 47G-3B-1
Bell 47G-3B-1 · Accident: loss of control in flight during takeoff
From Avondale, CO (no airport) to Avondale, CO (no airport)
Event
- NTSB case
- DEN07LA155
- 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-1
- 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
- N360SS
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Avondale, CO (no airport)To Avondale, CO (no airport)
- 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
- First occurrenceThe 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
- Loss of control in flight
- 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
- Pilot in command › Flare, improper
- Pilot in command › Translational lift, not attained
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 took off downhill with no wind. The wind shifted to the west to a tailwind of 10 to 12 knots. The pilot said he was "unable to gain effective translational lift" and he attempted to land with a forward speed of 5 to 6 mph. He attempted to stop the helicopter but in doing so, "the tail skid struck the ground at the same time the skids did. Then the aircraft lurched forward, causing the main rotor to come in contact with the tail boom." The tail boom was severed and the skids were broken torsionally from the airframe.
Probable cause
The pilot's failure to attain translational lift and his improper flare. A contributing factor in this accident was the sudden wind shift.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record DEN07LA155
- Event ID
- 20070919X01413
- Case number
- DEN07LA155
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
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: df5784a77d45442be1bb3d27a450916f38941822174d51925c093df6790af213; retrieved 2026-09-22T03:26:08.607Z.