# NTSB investigations, CO: 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 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 GAA16CA201](https://openairdocs.org/ntsb/GAA16CA201.md): Helicycle/Morrisey RR RM-1 · Denver, CO · Accident · Minor injuries · Data collection · Final report · Apr 22, 2016 · N867TV · Substantial damage
  > The pilot's failure to maintain control of the helicopter yaw while operating in conditions conducive to loss of tail rotor effectiveness, resulting in an uncommanded rapid right yaw and ground impact.
- [NTSB CEN13LA310](https://openairdocs.org/ntsb/CEN13LA310.md): Bell Helicopter Textron 206L-1 · La Junta, CO · Accident · No injuries · Limited investigation · Final report · May 7, 2013 · N20Z · Substantial damage
  > The pilot's inadequate compensation for wind during low-altitude operations, which resulted in a loss of tail rotor effectiveness.
- [NTSB CEN09LA413](https://openairdocs.org/ntsb/CEN09LA413.md): Bell Helicopter Textron 206L-1 · Breckenridge, CO · Accident · Serious injuries · Limited investigation · Final report · Jul 2, 2009 · N38AZ · Substantial damage
  > The pilot's failure to maintain directional control while maneuvering due to a loss of tail rotor effectiveness. Contributing to the accident was the pilot's failure to monitor wind direction while operating in the "Critical Wind Azimuth Area."

## 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."eventStateOrRegion" = 'CO' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '242' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/242/sequence?state=CO

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