# NTSB investigations: Franklin 6V4 series, MO

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 CEN13LA396](https://openairdocs.org/ntsb/CEN13LA396.md): Bell 47D1 · Lake Ozark, MO · Accident · No injuries · Limited investigation · Final report · Jun 28, 2013 · N78900 · Substantial damage
  > The improper rebuild and maintenance of the helicopter and inadequate subsequent inspections, which resulted in undetected fuel contamination and a subsequent total loss of engine power during cruise flight.
- [NTSB CHI01FA231](https://openairdocs.org/ntsb/CHI01FA231.md): World Helicopters 47D1 · Ballard, MO · Accident · 2 fatal · Field investigation · Final report · Jul 22, 2001 · N17301 · Destroyed
  > The pilot's improper preflight planning which resulted in fuel exhaustion, and the pilot's subsequent improper autorotation.
- [NTSB MKC89LA195](https://openairdocs.org/ntsb/MKC89LA195.md): Bell 47G · Ozark, MO · Accident · No injuries · Limited investigation · Final report · Sep 2, 1989 · N182JR · Substantial damage
  > The failure of the dual student to properly flare during an autorotative landing resulting in a hard landing and partial failure of the right skid. The CFI also failed to properly monitor the student's actions on the flight controls.
- [NTSB MKC88FA054](https://openairdocs.org/ntsb/MKC88FA054.md): Bell 47D1 · Nixa, MO · Accident · 1 fatal · Field investigation · Final report · Feb 21, 1988 · N7735 · Destroyed
  > During the process of moving the helicopter from the hangar the right skid slipped off the concrete helipad and became stuck in the mud. The pilot attempted to dislodge the skid by bringing the aircraft to a hover. The left skid became airborne and contacted…
- [NTSB MKC77FCG24](https://openairdocs.org/ntsb/MKC77FCG24.md): Bell 47D · Mt.Vernon, MO · Accident · Minor injuries · Closed · May 24, 1977 · N925V · Substantial damage
- [NTSB MKC72IK008](https://openairdocs.org/ntsb/MKC72IK008.md): Bell 47G · St Louis, MO · Incident · Serious injuries · Closed · Aug 3, 1971 · N54047 · Substantial damage

## 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" = 'MO' 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=MO

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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.