# NTSB investigations: Allison 250 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 ATL99LA036](https://openairdocs.org/ntsb/ATL99LA036.md): Bell 47G-3B-2 · Murfreesboro, TN · Accident · No injuries · Limited investigation · Final report · Dec 30, 1998 · N123NM · Substantial damage
  > The pilot's inadequate flare and his diverted attention, which resulted in a hard landing.
- [NTSB CHI98LA339](https://openairdocs.org/ntsb/CHI98LA339.md): Enstrom 480 · Green Bay, WI · Accident · No injuries · Limited investigation · Final report · Sep 16, 1998 · N142CC · Substantial damage
  > the pilot's failure to maintain adequate rotor rpm during a practice autorotation.
- [NTSB CHI98FA313](https://openairdocs.org/ntsb/CHI98FA313.md): Hiller FH-1100 · Dewitt, MI · Accident · 1 fatal · Field investigation · Final report · Aug 14, 1998 · N8171U · Destroyed
  > The rotor failure/malfunction due to debonding of the tail rotor blade. Also causal was the inadequate maintenance inspection of the aircraft by the company and the improper maintenance procedure by other maintenance personnel.

## 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 ('03014', '03019'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=03014&year=1998

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