# NTSB investigations: Bell 412: 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 FTW91FA155](https://openairdocs.org/ntsb/FTW91FA155.md): Bell 412 · Garden Banks · Accident · 1 fatal · Field investigation · Final report · Aug 26, 1991 · N3909F · Substantial damage
  > Overheating and subsequent failure of the number one tail rotor hanger bearing for an undeterined reason, and failure of the tail rotor drive shaft.
- [NTSB FTW91IA143](https://openairdocs.org/ntsb/FTW91IA143.md): Bell 412 · Rowan Midland · Incident · No injuries · Incident investigation · Final report · Aug 8, 1991 · N177EH · No damage
  > The mechanic's failure to assemble the tail rotor drive shaft correctly and the subsequent failure of the tail rotor drive shaft. A factor was the lack of inspection procedures for offshore maintenance.
- [NTSB ANC89FA069](https://openairdocs.org/ntsb/ANC89FA069.md): Bell 412 · Girdwood, AK · Accident · Minor injuries · Field investigation · Final report · May 6, 1989 · N524EH · Destroyed
  > A main rotor flight control bolt (part number 20-057-6-38D) came out of its rod end bearing while in flight due to the bolt being improperly torqued during maintenance.
- [NTSB FTW88FA036](https://openairdocs.org/ntsb/FTW88FA036.md): Bell 412 · Galveston, TX · Accident · Serious injuries · Field investigation · Final report · Dec 7, 1987 · N3910U · Destroyed
  > The acft landed hard in the gulf of Mexico during an autorotation that was entered following the separation of the 90 degree gearbox. The gearbox (with tail rotor blades) separated due to an imbalance. However, the gearbox was not recovered during the…
- [NTSB FTW83IA053](https://openairdocs.org/ntsb/FTW83IA053.md): Bell 412 · Intercoastal Ci, LA · Incident · No injuries · Incident investigation · Final report · Dec 2, 1982 · N2258F · No damage
  > While in cruise flight, the pilots heard a loud pop and felt a severe cyclic control vibration. An immediate precautionary landing was made. An examination revealed that there was a fatigue crack in the trailing edge of the blue, main rotor yoke flexure, pn…

## 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 ('1182202')
    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=1182202&occurrence=130

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OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.