# NTSB investigations: Bell 47G-3B-1: Airframe/component/system failure/malfunction

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

## Latest cases

- [NTSB DEN05LA137](https://openairdocs.org/ntsb/DEN05LA137.md): Bell 47G-3B-1 · Rock Springs, WY · Accident · No injuries · Limited investigation · Final report · Sep 13, 2005 · N24SD · Substantial damage
  > the pilot's failure to maintain control of the helicopter during the attempted autorotation after he experienced an engine overspeed that occurred for reasons undetermined.
- [NTSB LAX01LA098](https://openairdocs.org/ntsb/LAX01LA098.md): Bell 47-G3B1 · Winterhaven, CA · Accident · No injuries · Limited investigation · Final report · Feb 10, 2001 · N3084G · Substantial damage
  > A failure of the transmission free wheeling unit due to improper maintenance. A factor was the dark night visual condition.
- [NTSB SEA00FA061](https://openairdocs.org/ntsb/SEA00FA061.md): Bell 47G-3B-1 · Stanwood, WA · Accident · 1 fatal · Field investigation · Final report · Apr 2, 2000 · N3377H · Destroyed
  > The disengagement of the oil jet fitting from its threaded receptacle at the forward end of the engine crankshaft. This resulted in excessive oil within the clutch assembly, the subsequent slipping of the clutch, and ultimately the disengagement of the rotor…
- [NTSB FTW97LA264](https://openairdocs.org/ntsb/FTW97LA264.md): Bell 47G-3B-1 · Crossett, AR · Accident · Serious injuries · Limited investigation · Final report · Jul 13, 1997 · N83701 · Substantial damage
  > failure of maintenance personnel to perform an adequate inspection of the fuselage center frame and detect a fatigue fracture of a longeron tube on the upper left side of the center frame, which resulted in a disconnect of the tail rotor drive shaft from the…
- [NTSB NYC95LA147](https://openairdocs.org/ntsb/NYC95LA147.md): Bell 47G-3B-1 · Hammonton, NJ · Accident · 1 fatal · Limited investigation · Final report · Jul 10, 1995 · N48316 · Destroyed
  > failure of the collective yoke bearing, which resulted in an uncontrolled descent and collision with trees. A factor relating to the accident was: the manufacturer's inadequate inspection interval of the yoke bearing.
- [NTSB CHI91LA257](https://openairdocs.org/ntsb/CHI91LA257.md): Bell 47G · Lake Ozark, MO · Accident · No injuries · Limited investigation · Final report · Aug 11, 1991 · N61SD · Substantial damage
  > Failure of the rotorcraft's tail boom in flight. Factors related to the accident were reduced aircraft control available to the pilot.
- [NTSB NYC90DNA04](https://openairdocs.org/ntsb/NYC90DNA04.md): Bell 47G-3B-1 · Hanson, MA · Accident · No injuries · Final report · Aug 1, 1990 · N34691 · Substantial damage
  > The pilot's loss of control of the helicopter due to the failure of the tail rotor drive shaft.
- [NTSB MIA89LA165](https://openairdocs.org/ntsb/MIA89LA165.md): Bell 47G-3B-1 · Keystone Hgts., FL · Accident · Minor injuries · Limited investigation · Final report · May 30, 1989 · N53SP · Substantial damage
  > The tail rotor drive system became disconnected due to a bent tail rotor drive shaft. The trees contributed to the helicopter damage.
- [NTSB DEN88GA088](https://openairdocs.org/ntsb/DEN88GA088.md): Bell 47G-3B1 · Gobernador, NM · Accident · No injuries · Final report · Mar 21, 1988 · N7863S · Substantial damage
  > The commerical plt was hovering out of ground effect at 40 feet AGL. During a maneuver he reported hearing a loud bang and the rotor RPM began to decay. The plt made a hovering autorotation resulting in a hard landing. The main rotor struck the tail boom and…

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('1181028', '118103A')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 130))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=1181028&occurrence=130

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