# NTSB investigations: Lycoming IO-540-AE1A5, CO

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 CEN19LA162](https://openairdocs.org/ntsb/CEN19LA162.md): Robinson R44 · Last Chance, CO · Accident · Minor injuries · Class 3 · Limited · Final report · Jun 8, 2019 · N4504L · Substantial damage
  > The pilot's failure to maintain adequate main rotor rpm while descending with a tailwind during an aerial application maneuver, which resulted in an uncontrolled descent into terrain.
- [NTSB CEN18LA087](https://openairdocs.org/ntsb/CEN18LA087.md): Robinson Helicopter R44 II · Loveland, CO · Accident · Minor injuries · Limited investigation · Final report · Jan 26, 2018 · N878BC · 2 aircraft · Substantial damage
  > The airplane pilot’s failure to see and avoid the helicopter while in the traffic pattern, which resulted in a midair collision between the two aircraft. Contributing to the accident was the airplane pilot’s misunderstanding of the helicopter pilot’s…
- [NTSB CEN11CA511](https://openairdocs.org/ntsb/CEN11CA511.md): Robinson Helicopter R44 II · Broomfield, CO · Accident · No injuries · Data collection · Final report · Jul 23, 2011 · N915BW · Substantial damage
  > A loss of control due to the pilot's diverted attention as a result of an open door.

## 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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41899'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41899&state=CO

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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.