# NTSB investigations, WI: Not determined, general

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 CEN25LA378](https://openairdocs.org/ntsb/CEN25LA378.md): Cirrus Design SR22T · Racine, WI · Accident · No injuries · Class 4 · Limited · Final report · Sep 11, 2025 · N121JB · Substantial damage
  > A total loss of engine power for reasons that could not be determined.
- [NTSB CEN25LA149](https://openairdocs.org/ntsb/CEN25LA149.md): Pphu Ekolot KR-030 Topaz · Platteville, WI · Accident · Serious injuries · Class 3 · Limited · Final report · Apr 8, 2025 · N568RD · Substantial damage
  > The pilot’s failure to maintain clearance from terrain for reasons which could not be determined.
- [NTSB CEN24LA119](https://openairdocs.org/ntsb/CEN24LA119.md): Zenith Stol CH750 · Sextonville, WI · Accident · Serious injuries · Class 3 · Limited · Final report · Feb 23, 2024 · N750WW · Substantial damage
  > A loss of engine power for reasons that could not be determined, followed by a loss of control and subsequent impact with terrain.
- [NTSB CEN23LA099](https://openairdocs.org/ntsb/CEN23LA099.md): Piper PA-28-160 · Eau Claire, WI · Accident · No injuries · Class 3 · Limited · Final report · Feb 5, 2023 · N9770J · Destroyed
  > The engine fire that began for undetermined reasons following numerous engine start attempts.
- [NTSB CEN22LA103](https://openairdocs.org/ntsb/CEN22LA103.md): Cessna 120 · Sturtevant, WI · Accident · Serious injuries · Class 3 · Limited · Final report · Jan 18, 2022 · N90129 · Substantial damage
  > The pilot’s loss of directional control during the takeoff for reasons that could not be determined based on the available evidence, which resulted in a runway excursion.
- [NTSB CEN21FA459](https://openairdocs.org/ntsb/CEN21FA459.md): Rockwell International 690B · Hiles, WI · Accident · 3 fatal · Class 3 · Field · Final report · Sep 28, 2021 · N690LS · Destroyed
  > The pilot’s failure to maintain adequate airspeed, which caused the airplane to exceed its critical angle of attack and enter an inadvertent stall and spin.
- [NTSB CEN19LA060](https://openairdocs.org/ntsb/CEN19LA060.md): Stinson 108 · Keshena, WI · Accident · Serious injuries · Class 3 · Limited · Final report · Jan 19, 2019 · N97969 · Substantial damage
  > A total loss of engine power during cruise flight for undetermined reasons, which resulted in a forced landing and subsequent impact with trees.
- [NTSB CEN19FA018](https://openairdocs.org/ntsb/CEN19FA018.md): Eurocopter AS350 · Odanah, WI · Accident · 1 fatal · Field investigation · Final report · Oct 29, 2018 · N910S · Destroyed
  > The pilot's loss of helicopter control for undetermined reasons.
- [NTSB CEN18TA296](https://openairdocs.org/ntsb/CEN18TA296.md): Fisher Dakato Hawk · Oshkosh, WI · Accident · No injuries · Final report · Jul 26, 2018 · N677TS · Substantial damage
  > The failure of the left main landing gear for reasons that could not be determined, which resulted in a loss of directional control during the ground roll.
- [NTSB CEN18LA115](https://openairdocs.org/ntsb/CEN18LA115.md): Messerschmitt-Bolkow-Blohm BK 117 B-2 · Sheboygan, WI · Accident · No injuries · Limited investigation · Final report · Mar 5, 2018 · N1174U · Substantial damage
  > The restricted cyclic control movement for reasons that could not be determined because postaccident examination and testing of the cyclic control system did not reveal any evidence of mechanical malfunctions or failures that would have precluded normal…
- [NTSB CEN17FA248](https://openairdocs.org/ntsb/CEN17FA248.md): Cessna 421C · Catawba, WI · Accident · 6 fatal · Field investigation · Final report · Jul 1, 2017 · N2655B · Destroyed
  > A loss of control and subsequent in-flight breakup for reasons that could not be determined based on the available information.
- [NTSB CEN17LA037](https://openairdocs.org/ntsb/CEN17LA037.md): Johnson Kenneth R Stol CH 801 · Royalton, WI · Accident · Minor injuries · Limited investigation · Final report · Nov 6, 2016 · N801KJ · Destroyed
  > The loss of control during approach for reasons that could not be determined due to postimpact fire damage.
- [NTSB GAA17LA090](https://openairdocs.org/ntsb/GAA17LA090.md): Piper PA28R · Watertown, WI · Accident · No injuries · Limited investigation · Final report · Nov 5, 2016 · N300KR · Substantial damage
  > The pilot’s failure to attain a proper glidepath on approach for landing, which resulted in impact with trees. Contributing to the accident was a partial, temporary loss of engine power for reasons that could not be determined because postaccident examination…
- [NTSB CEN16LA302](https://openairdocs.org/ntsb/CEN16LA302.md): Sonex Waiex · Fond du Lac, WI · Accident · Serious injuries · Limited investigation · Final report · Aug 3, 2016 · N12YX · Substantial damage
  > A partial loss of engine for reasons that could not be determined during an examination of the engine.
- [NTSB CEN16LA123](https://openairdocs.org/ntsb/CEN16LA123.md): Brockman William A Challenger II · Neshkoro, WI · Accident · Serious injuries · Limited investigation · Final report · Mar 12, 2016 · N710WB · Substantial damage
  > A total loss of engine power for reasons that could not be determined, as postaccident examination revealed no anomalies that would have precluded normal operation. Contributing to the accident was the non-certificated pilot's decision to maneuver at low…
- [NTSB CEN16LA021](https://openairdocs.org/ntsb/CEN16LA021.md): Piper PA 28-235 · Winneconne, WI · Accident · No injuries · Limited investigation · Final report · Oct 24, 2015 · N3979X · Substantial damage
  > An engine compartment fire during landing, which resulted in extensive fire damage, for reasons that could not be determined during examinations of the remaining wreckage.
- [NTSB CEN15LA418](https://openairdocs.org/ntsb/CEN15LA418.md): Cessna 421B · Platteville, WI · Accident · Minor injuries · Limited investigation · Final report · Sep 21, 2015 · N813CA · Substantial damage
  > The partial loss of right engine power for undetermined reasons with insufficient runway remaining for the aborted takeoff.
- [NTSB CEN15LA217](https://openairdocs.org/ntsb/CEN15LA217.md): Cessna 150F · Neillsville, WI · Accident · Minor injuries · Limited investigation · Final report · May 2, 2015 · N8558G · Substantial damage
  > A partial loss of engine power for reasons that could not be determined because a postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.
- [NTSB CEN14LA443](https://openairdocs.org/ntsb/CEN14LA443.md): Piper PA 28-181 · Waukesha, WI · Accident · Minor injuries · Limited investigation · Final report · Jul 13, 2014 · N9681K · Substantial damage
  > The loss of engine power for reasons that could not be determined because no anomalies were identified during postaccident examination.
- [NTSB CEN14LA537](https://openairdocs.org/ntsb/CEN14LA537.md): Hughes TH 55A · Hudson, WI · Accident · Minor injuries · Limited investigation · Final report · Jun 10, 2014 · N5335U · Substantial damage
  > The nonhelicopter-rated pilot’s operation of the helicopter and its subsequent collision with trees during takeoff for reasons that could not be determined based on the available evidence.
- [NTSB CEN13LA502](https://openairdocs.org/ntsb/CEN13LA502.md): Anderas Tiger Moth R80 · New Franken, WI · Accident · Minor injuries · Limited investigation · Final report · Aug 24, 2013 · N927TM · Substantial damage
  > The loss of engine power during initial climb for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB CEN12LA661](https://openairdocs.org/ntsb/CEN12LA661.md): Lake LA4 · Kenosha, WI · Accident · No injuries · Limited investigation · Final report · Sep 27, 2012 · N1127L · Substantial damage
  > The loss of engine power for reasons that could not be determined because examination and test run of the engine did not reveal any anomalies that would have precluded normal operation.
- [NTSB CEN12FA617](https://openairdocs.org/ntsb/CEN12FA617.md): Beech A36 · Kansasville, WI · Accident · 1 fatal · Field investigation · Final report · Sep 9, 2012 · N3224G · Substantial damage
  > In-flight loss of control for reasons that could not be determined because postaccident examination of the pilot and testing of the airplane did not reveal any anomalies that would have led to the loss of control.
- [NTSB CEN12FA025](https://openairdocs.org/ntsb/CEN12FA025.md): Piper PA-28R-200 · Watertown, WI · Accident · No injuries · Field investigation · Final report · Oct 17, 2011 · N300KR · Substantial damage
  > The separation of the number 2 connecting rod from the crankshaft for reasons that could not be determined during postaccident metallurgical examination, which ultimately resulted in a total loss of engine power.
- [NTSB CEN11FA562](https://openairdocs.org/ntsb/CEN11FA562.md): Air Tractor AT-301 · Nekoosa, WI · Accident · No injuries · Field investigation · Final report · Aug 4, 2011 · N4345S · Substantial damage
  > A total loss of engine power during initial climb for undetermined reasons.
- [NTSB CEN11FA505](https://openairdocs.org/ntsb/CEN11FA505.md): Piper J3L-65 · Van Dyne, WI · Accident · 2 fatal · Field investigation · Final report · Jul 25, 2011 · N81BF · Substantial damage
  > The pilot’s inability to maintain airplane control while maneuvering for reasons that could not be determined from the available evidence.
- [NTSB CEN11LA522](https://openairdocs.org/ntsb/CEN11LA522.md): Cessna 172B · Middleton, WI · Accident · No injuries · Limited investigation · Final report · Jul 23, 2011 · N7624X · Substantial damage
  > The total loss of engine power during climb after takeoff for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB CEN11FA193](https://openairdocs.org/ntsb/CEN11FA193.md): Gulfstream Aerospace GV-SP · Appleton, WI · Accident · No injuries · Field investigation · Final report · Feb 14, 2011 · N535GA · Substantial damage
  > The pilot flying's (PF) decision to land on a shorter-than-recommended runway with a known left hydraulic system failure rather than go around as suggested by the pilot-not-flying, his failure to immediately apply emergency brakes following the detection of…
- [NTSB CEN11LA050](https://openairdocs.org/ntsb/CEN11LA050.md): Mcfarland Bill Challenger II · Praire Du Sac, WI · Accident · 1 fatal · Limited investigation · Final report · Nov 1, 2010 · N448WM · Substantial damage
  > The separation of the fuselage-mounted wing strut attachment fitting for an undetermined reason, which resulted in the separation of the left wing of the airplane.
- [NTSB CEN09CA522](https://openairdocs.org/ntsb/CEN09CA522.md): Grumman Acft ENG Cor-Schweizer G-164A · Evansville, WI · Accident · No injuries · Data collection · Final report · Aug 12, 2009 · N9794 · Substantial damage
  > A jam of the elevator flight control for undetermined reasons.
- [NTSB CHI08CA226](https://openairdocs.org/ntsb/CHI08CA226.md): American AA-1A · Grantsburg, WI · Accident · Minor injuries · Data collection · Final report · Jul 22, 2008 · N9483L · Substantial damage
  > A loss of engine power for an undetermined reason.
- [NTSB CHI08CA188](https://openairdocs.org/ntsb/CHI08CA188.md): Cessna 177A · Rhinelander, WI · Accident · No injuries · Data collection · Final report · Jul 1, 2008 · N2295Y · Substantial damage
  > The loss of engine power for an undetermined reason. A factor was the berm encountered during the forced landing.
- [NTSB CHI08LA190](https://openairdocs.org/ntsb/CHI08LA190.md): de Havilland DHC-6-200 · Baldwin, WI · Accident · No injuries · Limited investigation · Final report · Jun 29, 2008 · N203SF · Substantial damage
  > Undetermined.
- [NTSB CHI08FA135](https://openairdocs.org/ntsb/CHI08FA135.md): Piper PA-28-140 · Stevens Point, WI · Accident · 2 fatal · Field investigation · Final report · May 12, 2008 · N1813T · Substantial damage
  > The partial loss of engine power for undetermined reasons.
- [NTSB CHI08CA127](https://openairdocs.org/ntsb/CHI08CA127.md): Cessna 140 · Burlington, WI · Accident · Minor injuries · Data collection · Final report · May 9, 2008 · N89307 · Substantial damage
  > A loss of engine power for undetermined reasons. Contributing to the accident was the low altitude at the time of the loss of engine power.

## 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" = 'WI' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT f.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_findings.parquet' f WHERE starts_with(f."findingCode", '05000000'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-findings/05000000/cases?state=WI

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