# NTSB investigations: Franklin 6A4200 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 CHI88DEC05](https://openairdocs.org/ntsb/CHI88DEC05.md): Bell 47D1 (OH-13E) · Stockbridge, MI · Accident · No injuries · Final report · Jul 11, 1988 · N12087 · Substantial damage
  > The plt was spraying an onion field when he noted a vibration, followed by a loud noise & severe shaking of the helicopter. He attempted a forced landing, but the helicopter was unresponsive to cyclic & collective inputs. Subsequently, the right skid dug into…
- [NTSB CHI79DEM02](https://openairdocs.org/ntsb/CHI79DEM02.md): Bell 47G · Saginaw, MI · Accident · No injuries · Closed · Oct 1, 1978 · N7762 · Substantial damage
- [NTSB CHI77FEM43](https://openairdocs.org/ntsb/CHI77FEM43.md): Hiller UH-12B · Carrollton, MI · Accident · No injuries · Closed · Sep 26, 1977 · N94735 · 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 ('27027'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=27027&state=MI

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