# NTSB investigations: Rolls-Royce 250-C300/A1: Unknown or undetermined

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 CEN25FA367](https://openairdocs.org/ntsb/CEN25FA367.md): Robinson Helicopter R66 · Lakeville, MN · Accident · 2 fatal · Class 3 · Field · Preliminary report · Sep 6, 2025 · N6633L · Destroyed
  > On September 6, 2025, about 1442 central daylight time, a Robinson Helicopter Company R66 helicopter, N6633L was destroyed when it was involved in an accident near Lakeville, Minnesota. The pilot and passenger were fatally injured. The helicopter was operated…
- [NTSB ANC25FA044](https://openairdocs.org/ntsb/ANC25FA044.md): Robinson Helicopter R66 · Kaparuk, AK · Accident · 2 fatal · Class 3 · Field · Preliminary report · Jun 4, 2025 · N962MD · Substantial damage
  > On June 4, 2025 about 1055 Alaska daylight time, a Robinson R66 turbine-powered helicopter, N962MD, was substantially damaged when it was involved in an accident near Kaparuk, Alaska. The pilot and passenger were fatally injured. The helicopter was operated…
- [NTSB ANC21LA020](https://openairdocs.org/ntsb/ANC21LA020.md): Robinson Helicopter R66 · Kodiak, AK · Accident · 1 fatal · Class 3 · Limited · Final report · Mar 3, 2021 · N1767 · Destroyed
  > An impact with ocean waters for reasons that could not be determined based on the available information.

## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('54232')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '000'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/000/cases?engine=54232

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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.