# NTSB investigations: Allison 250-C20 series: Loss of tail rotor effectiveness

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 WPR22FA101](https://openairdocs.org/ntsb/WPR22FA101.md): Mcdonnell Douglas 500N · Newport Beach, CA · Accident · 1 fatal · Class 3 · Field · Final report · Feb 20, 2022 · N521HB · Substantial damage
  > The helicopter’s encounter with unanticipated right yaw during a low-altitude, low-airspeed, tight-radius orbit. Contributing to the accident was the pilot’s distraction during the orbit, which resulted in the loss of control, his fatigue due to his early…
- [NTSB CEN22FA086](https://openairdocs.org/ntsb/CEN22FA086.md): Bell 206B · Livingston, TX · Accident · 2 fatal · Class 3 · Field · Final report · Dec 30, 2021 · N8AU · Substantial damage
  > The pilot exceeding the yaw control capability of the helicopter for the flight conditions, resulting in a non-mechanical loss of tail rotor effectiveness.
- [NTSB CEN20LA273](https://openairdocs.org/ntsb/CEN20LA273.md): Aerospatiale AS355 · Rifle, CO · Accident · Serious injuries · Class 3 · Limited · Final report · Jul 11, 2020 · N708AC · Destroyed
  > A loss of tail rotor effectiveness, the pilot’s subsequent loss of helicopter control, and collision with terrain.
- [NTSB GAA17CA369](https://openairdocs.org/ntsb/GAA17CA369.md): Bell 206B · Entiat, WA · Accident · No injuries · Data collection · Final report · Jun 26, 2017 · N183TC · Substantial damage
  > The pilot’s failure to secure a loose item inside the cockpit that interfered with antitorque pedal control and led to a loss of helicopter control due to a loss of tail rotor effectiveness.
- [NTSB GAA15CA102](https://openairdocs.org/ntsb/GAA15CA102.md): Bell 206 - B11 · Caledonia, MI · Accident · No injuries · Data collection · Final report · May 29, 2015 · N206ED · Substantial damage
  > A loss of tail rotor effectiveness while maneuvering at low altitude, resulting in a collision with trees.
- [NTSB SEA08LA213](https://openairdocs.org/ntsb/SEA08LA213.md): Bell 206B · Woods Landing-Jelm, WY · Accident · Serious injuries · Limited investigation · Final report · Sep 27, 2008 · N59611 · Substantial damage
  > The pilot's encounter with a loss of tail rotor effectiveness event and his failure to maintain directional control while maneuvering. Contributing to the accident were the tailwind condition and the sloping, uneven terrain.

## 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 ('03020')
    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" = '242'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/242/cases?engine=03020

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