# NTSB investigations: Bell 47G-2: 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 SEA95LA126](https://openairdocs.org/ntsb/SEA95LA126.md): Bell 47G-2 · Zillah, WA · Accident · Serious injuries · Limited investigation · Final report · Jun 24, 1995 · N1968H · Substantial damage
  > The failure of company maintenance personnel to perform adequate inspections of the helicopter, and the failure of the cyclic control rod due to corrosion.
- [NTSB CHI95LA003](https://openairdocs.org/ntsb/CHI95LA003.md): Bell 47G2 · Decatur, IL · Accident · Minor injuries · Limited investigation · Final report · Oct 3, 1994 · N5193B · Substantial damage
  > the failure of the roller springs in the freewheeling unit of the transmission which caused the unit to disengage.
- [NTSB SEA91LA077](https://openairdocs.org/ntsb/SEA91LA077.md): Bell BH-47G2A · Waitsburg, WA · Accident · No injuries · Limited investigation · Final report · Mar 31, 1991 · N38926 · Substantial damage
  > The improper installation of the main rotor mast nut and lock washer by maintenance personnel which resulted in the separation of the main rotor system.
- [NTSB MKC90LA088](https://openairdocs.org/ntsb/MKC90LA088.md): Bell 47 · Oakdale, MN · Accident · Serious injuries · Limited investigation · Final report · Apr 18, 1990 · N5120B · Substantial damage
  > A slipping rotor drive clutch assembly due to improper maintenance by company personnel. Contributing factors were static wires in the path.
- [NTSB FTW88LA008](https://openairdocs.org/ntsb/FTW88LA008.md): Bell 47G-2 · Lapra, TX · Accident · No injuries · Limited investigation · Final report · Oct 20, 1987 · N8403E · Substantial damage
  > Upon entering a bank approx. 80 to 100 ft. off the ground, the aircraft experienced a power loss with vibration. During autorotation the aircraft contacted a tree causing substantial damage. Examination of the wreckage found the transmission clutch assembly…
- [NTSB MIA87LA190](https://openairdocs.org/ntsb/MIA87LA190.md): Bell 47G-2 · Miami, FL · Accident · No injuries · Limited investigation · Final report · Jun 20, 1987 · N6772D · Substantial damage
  > The instructor plt stated that the helicopter began to vibrate while the student plt was maneuvering it during an instructional flt. The instructor plt then executed a forced landing and upon touchdown the main rotor blades contacted the ground. Inspection of…
- [NTSB LAX85LA400](https://openairdocs.org/ntsb/LAX85LA400.md): Bell 47G-2 · Watsonville, CA · Accident · No injuries · Limited investigation · Final report · Sep 21, 1985 · N2874B · Substantial damage
  > During an ag flt, at abt 5 ft AGL, the plt heard a loud bang, the eng oversped, & all pwr to the rotor blades was lost. The plt attempted to immediately land in the underlying field, but had insufficient altitude/airspeed to autorotate. The acft touched down,…
- [NTSB MIA85LA223](https://openairdocs.org/ntsb/MIA85LA223.md): Bell 47G-2 · Ochopee, FL · Accident · No injuries · Limited investigation · Final report · Aug 1, 1985 · N88AR · Substantial damage
  > The plt stated that he dropped his passenger off at a water station in the everglades, water taxied away from the station, accellerated up to 3100 RPM & just before he added collective pitch the transmission ass'y departed the helicopter, it rolled to the…
- [NTSB ANC83FA092](https://openairdocs.org/ntsb/ANC83FA092.md): Bell B47G-2 · Anchorage, AK · Accident · No injuries · Field investigation · Final report · Jun 7, 1983 · N6140C · Substantial damage
  > The helicopter experienced a tail rotor strike during a hard landing with a door open. According to the student pilot who is a commercial pilot working on an add-on helicopter rating, the left cockpit door unlatched and partially opened on the downwind leg…

## 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 ('1181008')
    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=1181008&occurrence=130

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