# NTSB investigations: Franklin 6V4 series, 1998

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 CHI99LA012](https://openairdocs.org/ntsb/CHI99LA012.md): Hiller UH-12C · Clinton, IA · Accident · No injuries · Limited investigation · Final report · Oct 24, 1998 · N9739C · Substantial damage
  > the failure of the 90 degree gearbox for reasons undetermined. Factors were the failure of the gearbox, and it not being possible for the pilot to maintain control of the aircraft.
- [NTSB MIA98LA254](https://openairdocs.org/ntsb/MIA98LA254.md): Bell 47-D1 · Oxford, MS · Accident · Minor injuries · Limited investigation · Final report · Sep 29, 1998 · N755E · Substantial damage
  > The pilot's failure to maintain directional control due to vibration from the main rotor blade for undetermined reasons. A related finding was the improper repair of a crack in the laminant of the blue main rotor blade by other maintenance personnel.
- [NTSB MIA98LA170](https://openairdocs.org/ntsb/MIA98LA170.md): Bell 47G · Bunnell, FL · Accident · No injuries · Limited investigation · Final report · May 28, 1998 · N182JR · Substantial damage
  > The pilot-in-command(CFI) failure to maintain control of the aircraft.
- [NTSB FTW98LA144](https://openairdocs.org/ntsb/FTW98LA144.md): Bell 47D1 · Jeanerette, LA · Accident · Minor injuries · Limited investigation · Final report · Mar 11, 1998 · N13012 · Substantial damage
  > The in-flight disconnect of the rotating scissors due to the separation of its hinge bolt.
- [NTSB MIA98LA051](https://openairdocs.org/ntsb/MIA98LA051.md): Bell 47D1 · Bunnell, FL · Accident · No injuries · Limited investigation · Final report · Jan 3, 1998 · N59326 · Substantial damage
  > the student pilot's improper planning/decision, which resulted in fuel exhaustion, loss of engine power, and a forced landing.

## 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 year(c."eventDate") = 1998
  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&year=1998

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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.