# NTSB investigations: Allison 250-C30 series: Dynamic rollover

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 CEN23LA064](https://openairdocs.org/ntsb/CEN23LA064.md): Bell 206-L4 · Gulf of Mexico (Gulf of Mexico) · Accident · Minor injuries · Class 3 · Limited · Final report · Dec 15, 2022 · N414RL · Substantial damage
  > The pilot’s improper takeoff technique that allowed the helicopter skid to drift into a helideck light, resulting in a dynamic rollover.
- [NTSB GAA17CA132](https://openairdocs.org/ntsb/GAA17CA132.md): Bell Helicopter Textron 206 · Carson City, NV · Accident · Minor injuries · Data collection · Final report · Feb 2, 2017 · N519EH · Substantial damage
  > The pilot-in-command’s delayed remedial action to arrest the right yaw after the bounced landing while operating in a flight regime conducive to the loss of tail rotor effectiveness, which resulted in a roll-over.
- [NTSB CEN12CA191](https://openairdocs.org/ntsb/CEN12CA191.md): Bell 206L-3 · Southern Timbalier 52CA · Accident · No injuries · Data collection · Final report · Mar 12, 2012 · N104LP · Substantial damage
  > The pilot’s inadequate preflight inspection when he did not remove a tie-down strap prior to takeoff, which resulted in a dynamic rollover.

## 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 ('03015')
    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" = '231'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/231/cases?engine=03015

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