# NTSB investigations, MN: Unknown

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 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 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 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 CHI03LA269](https://openairdocs.org/ntsb/CHI03LA269.md): Holden Pulsar · Willmar, MN · Accident · 2 fatal · Limited investigation · Final report · Aug 16, 2003 · N78DT · Destroyed
  > The pilot's failure to maintain adequate airspeed resulting in an inadvertent stall/spin.
- [NTSB CHI91FA116](https://openairdocs.org/ntsb/CHI91FA116.md): Mooney M-20C · Prior Lake, MN · Accident · 1 fatal · Field investigation · Final report · Mar 26, 1991 · N9692M · Destroyed
  > Failure to maintain airspeed while executing a forced landing. Factors related to the accident were the pilot's improper inflight planning/decision, and fuel exhaustion.
- [NTSB CHI90FA185](https://openairdocs.org/ntsb/CHI90FA185.md): Piper PA-28-140 · Grand Marais, MN · Accident · 3 fatal · Field investigation · Final report · Jul 14, 1990 · N6146W · Destroyed
  > Poor judgement of the pilot due to his impairment from consumption of alcohol, and his failure to maintain control of the aircraft. A factor related to the accident was: pilot fatigue due to lack of sleep.
- [NTSB CHI88FA153](https://openairdocs.org/ntsb/CHI88FA153.md): Piper PA-38-112 · Hamm Lake, MN · Accident · 2 fatal · Field investigation · Final report · Jul 3, 1988 · N2485N · Destroyed
  > Loss of control in flight, either by the student or by the instructor, at an altitude insufficient to allow for a recovery, by the flight instructor, before the resulting out of control descent caused the accident airplane to strike the terrain.
- [NTSB CHI87FA083](https://openairdocs.org/ntsb/CHI87FA083.md): Cessna 172N · Fergus Falls, MN · Accident · 4 fatal · Field investigation · Final report · Feb 12, 1987 · N734MV · Destroyed
  > Following a 1.5 hour personal flight at night, the aircraft crashed into the side of a low hill near the destination airport. Although the pilot had a total of 6 hours of night time, most of his solo night time was during this last flight. Hazy VFR conditions…
- [NTSB MKC78FA066](https://openairdocs.org/ntsb/MKC78FA066.md): Cessna 172N · Blaine, MN · Accident · 2 fatal · Closed · Aug 20, 1978 · N733SD · Destroyed
- [NTSB MKC67A0067](https://openairdocs.org/ntsb/MKC67A0067.md): Hughes 269B · Federal Dam, MN · Accident · 2 fatal · Closed · May 12, 1967 · N700 · Destroyed
- [NTSB UNK64X0416](https://openairdocs.org/ntsb/UNK64X0416.md): Taylorcraft BC12D · Henning Minn, MN · Accident · 2 fatal · Closed · Feb 1, 1964 · N96885 · Destroyed

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
WITH phase_names(main, name) AS (VALUES (100, 'Prior to flight'), (150, 'Standing'), (200, 'Pushback/towing'), (250, 'Taxi'), (300, 'Takeoff'), (350, 'Initial climb'), (400, 'Enroute'), (450, 'Maneuvering'), (500, 'Approach'), (550, 'Landing'), (600, 'Emergency descent'), (650, 'Uncontrolled descent'), (700, 'Post-impact'), (750, 'After landing'), (800, 'Other'), (990, 'Unknown')),
  crosswalk(code, main, name) AS (VALUES (500, 150, 'Standing'), (501, 150, 'Standing - pre-flight'), (502, 150, 'Standing - starting engine(s)'), (503, 150, 'Standing - engine(s) operating'), (504, 150, 'Standing - engine(s) not operating'), (505, 150, 'Standing - idling rotors'), (510, 250, 'Taxi'), (511, 200, 'Taxi - pushback/tow'), (512, 250, 'Taxi - to takeoff'), (513, 250, 'Taxi - from landing'), (514, 250, 'Taxi - aerial'), (520, 300, 'Takeoff'), (521, 300, 'Takeoff - roll/run'), (522, 350, 'Takeoff - initial climb'), (523, 300, 'Takeoff - aborted'), (530, 400, 'Climb'), (531, 400, 'Climb - to cruise'), (540, 400, 'Cruise'), (541, 400, 'Cruise - normal'), (542, 400, 'Maneuvering - holding (IFR)'), (550, 400, 'Descent'), (551, 400, 'Descent - normal'), (552, 600, 'Descent - emergency'), (553, 650, 'Descent - uncontrolled'), (560, 500, 'Approach'), (561, 500, 'Approach - VFR pattern - downwind'), (562, 500, 'Approach - VFR pattern - base turn'), (563, 500, 'Approach - VFR pattern - base leg/base to final'), (564, 500, 'Approach - VFR pattern - final approach'), (565, 500, 'Go-around (VFR)'), (566, 500, 'Approach - IAF to FAF/outer marker (IFR)'), (567, 500, 'Approach - FAF/outer marker to threshold (IFR)'), (568, 500, 'Circling (IFR)'), (569, 500, 'Missed approach (IFR)'), (570, 550, 'Landing'), (571, 550, 'Landing - flare/touchdown'), (572, 550, 'Landing - roll'), (573, 550, 'Landing - aborted'), (574, 550, 'Emergency landing'), (575, 550, 'Emergency landing after takeoff'), (576, 600, 'Emergency descent/landing'), (580, 450, 'Maneuvering'), (581, 450, 'Maneuvering - aerial application'), (582, 450, 'Maneuvering - turn to reverse direction'), (583, 450, 'Maneuvering - turn to landing area (emergency)'), (590, 450, 'Hover'), (591, 450, 'Hover - in ground effect'), (592, 450, 'Hover - out of ground effect'), (600, 800, 'Other'), (610, 990, 'Unknown')),
  current_codes AS (
    SELECT e.case_mkey, TRY_CAST(e."tier1Number" AS INTEGER) AS code,
      row_number() OVER (PARTITION BY e.case_mkey ORDER BY coalesce(e."isDefiningEvent", false) DESC, e.position) AS n
    FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e
    WHERE e.aircrafts_position = 1 AND e."tier1Number" GLOB '[1-9][0-9]*'
      AND (e."isDefiningEvent" OR e.case_mkey IN (SELECT "mKey" FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' WHERE "isPre1982"))
  ),
  phases AS (
    SELECT case_mkey, 'current' AS scheme, code, CASE WHEN code >= 990 THEN 990 ELSE code // 50 * 50 END AS main
    FROM current_codes WHERE n = 1
    UNION ALL
    SELECT o.case_mkey, 'older', o."phaseOfFlightCode", w.main
    FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o JOIN crosswalk w ON w.code = o."phaseOfFlightCode"
    WHERE o.aircrafts_position = 1 AND o."occurrenceNumber" = 1 AND o.case_mkey NOT IN (SELECT case_mkey FROM current_codes)
  ),
  case_phases AS (
    SELECT p.*, c."eventDate", c."highestInjuryLevel" = 'Fatal' AS fatal, a.aircraft_model_code
    FROM phases p JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = p.case_mkey
    LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = p.case_mkey AND a.position = 1
    WHERE c."eventDate" >= DATE '1962-01-01' AND p.main IN (SELECT main FROM phase_names)
  )
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 case_mkey FROM case_phases WHERE main = 990)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-phases/990/cases?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.