# NTSB investigations: Franklin 6V4 series, MI

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 CHI90DEC04](https://openairdocs.org/ntsb/CHI90DEC04.md): Bell 47 D-1 · Stockbridge, MI · Accident · Serious injuries · Final report · Aug 14, 1990 · N3656F · Destroyed
  > The restricted visual lookout which resulted from the canopy fogging up.
- [NTSB CHI84LA184](https://openairdocs.org/ntsb/CHI84LA184.md): Bell 47D1 · Alpena, MI · Accident · Serious injuries · Limited investigation · Final report · May 20, 1984 · N9158R · Destroyed
  > Prior to the accident, the owner/plt of the helicopter reportedly 'buzzed' a local baseball game. Shortly after that, the helicopter was observed to maneuver over a wooded area, enter a nose high attitude, then roll or bank & enter a descent into a wooded…
- [NTSB CHI80FEC26](https://openairdocs.org/ntsb/CHI80FEC26.md): Bell 47D1 · Munith, MI · Accident · 1 fatal · Closed · Jul 30, 1980 · N3656F · Substantial damage
- [NTSB CHI79FEM34](https://openairdocs.org/ntsb/CHI79FEM34.md): Bell 47G-2 · Hart, MI · Accident · No injuries · Closed · Aug 16, 1979 · N4734S · Substantial damage
- [NTSB CHI78FEM34](https://openairdocs.org/ntsb/CHI78FEM34.md): Bell 47G · Chippewa, MI · Accident · No injuries · Closed · Aug 19, 1978 · N5237A · Substantial damage
- [NTSB CHI74DEM57](https://openairdocs.org/ntsb/CHI74DEM57.md): Bell 47G · Hart, MI · Accident · Minor injuries · Closed · May 1, 1974 · N4734S · Substantial damage
- [NTSB CHI73FEM24](https://openairdocs.org/ntsb/CHI73FEM24.md): Bell 47G · Mt Pleasant, MI · Accident · Minor injuries · Closed · Oct 26, 1972 · N141B · Substantial damage
- [NTSB CHI67A0087](https://openairdocs.org/ntsb/CHI67A0087.md): Hiller UH-12B · Fairhaven, MI · Accident · No injuries · Closed · Jan 15, 1967 · N5304V · Destroyed

## 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."eventStateOrRegion" = 'MI' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('27033'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27033&state=MI

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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.