# NTSB investigations: Allison 250 SER 250HP: Loss of control in flight

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 CEN20LA328](https://openairdocs.org/ntsb/CEN20LA328.md): Bell 206 · Marathon, TX · Accident · 3 fatal · Class 3 · Limited · Final report · Aug 8, 2020 · N284S · Destroyed
  > The in-flight loss of helicopter control for reasons that could not be determined based on the available evidence.
- [NTSB WPR19LA194](https://openairdocs.org/ntsb/WPR19LA194.md): Bell 47G 3B 1 · Mosby, MT · Accident · Serious injuries · Class 3 · Limited · Final report · Jul 13, 2019 · N3078G · Substantial damage
  > The pilot’s failure to account for environmental conditions conducive to a loss of tail rotor effectiveness, which resulted in a loss of tail rotor effectiveness and subsequent loss of control. Contributing to the accident was the pilot’s inappropriate…
- [NTSB CEN12LA258](https://openairdocs.org/ntsb/CEN12LA258.md): Bell 206B · Amarillo, TX · Accident · Minor injuries · Limited investigation · Final report · Apr 26, 2012 · N2068X · Substantial damage
  > The pilot's failure to maintain helicopter control during landing in gusty wind conditions associated with a thunderstorm, which resulted in a loss of tail rotor effectiveness.
- [NTSB NYC08LA287](https://openairdocs.org/ntsb/NYC08LA287.md): Bell 206A · Barnesville, PA · Accident · Serious injuries · Limited investigation · Final report · Aug 22, 2008 · N67AR · Substantial damage
  > The pilot's failure to maintain control of the helicopter during the low-speed, low-altitude maneuver which resulted in a loss of tail rotor effectiveness.
- [NTSB ANC08LA040](https://openairdocs.org/ntsb/ANC08LA040.md): Bell 206L · Nikolai, AK · Accident · Minor injuries · Limited investigation · Final report · Mar 4, 2008 · N404EH · Substantial damage
  > The pilot's inadequate compensation for wind conditions, and an inadvertent loss of tail rotor effectiveness while maneuvering. A factor contributing to the accident was wind gusts.

## 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 ('03002', '03003')
    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" = '240'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/240/cases?engine=03002

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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.