# NTSB investigations: Allison 250-C20 series, MN

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 CEN12CA319](https://openairdocs.org/ntsb/CEN12CA319.md): Hughes 369HS · Delavan, MN · Accident · Serious injuries · Data collection · Final report · May 25, 2012 · N11ZX · Substantial damage
  > The pilot’s failure to maintain clearance with power lines during an aerial application flight.
- [NTSB CEN11CA533](https://openairdocs.org/ntsb/CEN11CA533.md): Garlick Helicopters OH-58C · Rushford, MN · Accident · No injuries · Data collection · Final report · Jul 31, 2011 · N82855 · Substantial damage
  > The pilot's diverted attention, which resulted in the failure to maintain clearance from the power line.
- [NTSB CHI07LA193](https://openairdocs.org/ntsb/CHI07LA193.md): Hughes 369D · Comfrey, MN · Accident · No injuries · Limited investigation · Final report · Jul 5, 2007 · N500NC · Substantial damage
  > The loss of engine power due to the loose pressure line during aerial application maneuvers which resulted in a hard forced landing.
- [NTSB CHI04LA017](https://openairdocs.org/ntsb/CHI04LA017.md): Hughes 369HS · Evansville, MN · Accident · Minor injuries · Limited investigation · Final report · Oct 21, 2003 · N49TJ · Substantial damage
  > The pilot's misjudgment of clearance from the surface of the lake during the aerial application pass. The low altitude operation, glassy water, and his visual perception were contributing factors.
- [NTSB CHI03LA172](https://openairdocs.org/ntsb/CHI03LA172.md): Bell 206B · Baxter, MN · Accident · Minor injuries · Limited investigation · Final report · Jun 20, 2003 · N79BH · Substantial damage
  > The pilot's failure to maintain control of the helicopter due to a loss of tail rotor effectiveness. Factors contributing to this accident were the helicopter's low airspeed, low altitude, the crosswind, and the trees.
- [NTSB CHI01LA327](https://openairdocs.org/ntsb/CHI01LA327.md): Bell 206B-III · Park Rapids, MN · Accident · Minor injuries · Limited investigation · Final report · Sep 27, 2001 · N56MC · Substantial damage
  > The pilot not maintaining altitude/clearance when he maneuvered above the glassy lake. A factor to the accident was the glassy lake condition.
- [NTSB CHI00FA020](https://openairdocs.org/ntsb/CHI00FA020.md): Bell 206B · Cottage Grove, MN · Accident · 2 fatal · Field investigation · Final report · Nov 1, 1999 · N565KS · Destroyed
  > Undetermined.
- [NTSB CHI98TA354](https://openairdocs.org/ntsb/CHI98TA354.md): Bell 206B-3 · Hinkley, MN · Accident · No injuries · Final report · Sep 12, 1998 · N52BH · Substantial damage
  > Loss of engine power due to failure of the engine governor.

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

This list as a web page: https://openairdocs.org/ntsb?engine=03020&state=MN

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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.