# NTSB investigations, MN: Unknown or undetermined

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 CEN25FA367](https://openairdocs.org/ntsb/CEN25FA367.md): Robinson Helicopter R66 · Lakeville, MN · Accident · 2 fatal · Class 3 · Field · Preliminary report · Sep 6, 2025 · N6633L · Destroyed
  > On September 6, 2025, about 1442 central daylight time, a Robinson Helicopter Company R66 helicopter, N6633L was destroyed when it was involved in an accident near Lakeville, Minnesota. The pilot and passenger were fatally injured. The helicopter was operated…
- [NTSB CEN25LA304](https://openairdocs.org/ntsb/CEN25LA304.md): Ayres S2R-G6 · Slayton, MN · Accident · Serious injuries · Class 3 · Limited · Preliminary report · Aug 6, 2025 · N2239V · Substantial damage
  > On August 6, 2025, about 1300 central daylight time, a Ayres Corporation S2R-G6, airplane, registration N2239V, was substantially damaged when it was involved in an accident near Slayton, Minnesota. The pilot was seriously injured. The airplane was operated…
- [NTSB CEN23LA376](https://openairdocs.org/ntsb/CEN23LA376.md): Sixchuter Spirit XL · Hovland, MN · Accident · 1 fatal · Class 4 · Limited · Final report · Aug 18, 2023 · N538DR · Destroyed
  > The collision with the lake by a noncertificated pilot for reasons that could not be determined.
- [NTSB CEN23LA337](https://openairdocs.org/ntsb/CEN23LA337.md): Cub Crafters CCX-2000 · Winsted, MN · Accident · No injuries · Class 3 · Limited · Final report · Jul 30, 2023 · N967DT · Substantial damage
  > A total loss of engine power on approach for undetermined reasons.
- [NTSB CEN23FA269](https://openairdocs.org/ntsb/CEN23FA269.md): Schweizer G-164B · Beltrami, MN · Accident · 1 fatal · Class 3 · Field · Final report · Jun 27, 2023 · N7503H · Substantial damage
  > A collision with terrain and subsequent nose over for undetermined reasons.
- [NTSB ERA23FA130](https://openairdocs.org/ntsb/ERA23FA130.md): Cirrus Design SR22 · Duluth, MN · Accident · 1 fatal · Class 3 · Field · Final report · Feb 24, 2023 · N929DR · Destroyed
  > A rapid descent and subsequent collision with terrain for reasons that could not be determined based on the available evidence.
- [NTSB CEN22FA111](https://openairdocs.org/ntsb/CEN22FA111.md): Cirrus Design SR22 · Hutchinson, MN · Accident · 1 fatal · Class 3 · Field · Final report · Jan 31, 2022 · N227BD · Substantial damage
  > The reduction in fuel flow and subsequent partial loss of engine power after takeoff for reasons that could not be determined.
- [NTSB CEN21LA004](https://openairdocs.org/ntsb/CEN21LA004.md): Piper PA46 · Lake Elmo, MN · Accident · Serious injuries · Class 3 · Limited · Final report · Oct 2, 2020 · N62ZM · Substantial damage
  > A total loss of engine power for reasons that could not be determined.
- [NTSB CEN20LA392](https://openairdocs.org/ntsb/CEN20LA392.md): Cessna 172 · Cottage Grove, MN · Accident · 3 fatal · Class 3 · Limited · Final report · Sep 13, 2020 · N8488L · Destroyed
  > A steep descent and impact with terrain for reasons that could not be determined based on the available information.
- [NTSB CEN18FA083](https://openairdocs.org/ntsb/CEN18FA083.md): Skwira Matthew J W-10 Tailwind · Sauk Centre, MN · Accident · 1 fatal · Field investigation · Final report · Jan 23, 2018 · N251WT · Substantial damage
  > Impact with terrain for reasons that could not be determined based on the available information.
- [NTSB CEN14FA034](https://openairdocs.org/ntsb/CEN14FA034.md): Piper PA 23-250 · Caledonia, MN · Accident · 3 fatal · Field investigation · Final report · Nov 1, 2013 · N6068Y · Substantial damage
  > The pilot's loss of control for reasons that could not be determined because the postaccident airplane examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB CEN12FAMS1](https://openairdocs.org/ntsb/CEN12FAMS1.md): Piper PA-31-325 · Duluth, MN · Accident · 1 fatal · Missing aircraft · Final report · Jun 8, 2012 · N174BH · Substantial damage
  > Undetermined because the airplane was not found.
- [NTSB CEN11FA133](https://openairdocs.org/ntsb/CEN11FA133.md): Piper PA-46-310P · Milaca, MN · Accident · 2 fatal · Field investigation · Final report · Dec 30, 2010 · N9103N · Substantial damage
  > The pilot did not recover from an unusual attitude while operating in instrument meteorological conditions following a disconnect of the autopilot system for undetermined reasons. Contributing to the accident were the pilot’s lack of recent flight experience…

## 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 s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '000' 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/000/sequence?state=MN

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