# NTSB investigations: Lycoming 0-540 series, WI

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 CEN26LA025](https://openairdocs.org/ntsb/CEN26LA025.md): Piper PA-24-250 · Eau Claire, WI · Accident · No injuries · Class 4 · Limited · Final report · Oct 19, 2025 · N5865P · Substantial damage
  > The pilot’s failure to ensure that the landing gear was properly extended before landing. Contributing to the accident was the pilot’s unfamiliarity with the landing gear warning horn and failure to verify the gear was extended with the cockpit position…
- [NTSB CEN24LA322](https://openairdocs.org/ntsb/CEN24LA322.md): Piper PA-32-260 · Chetek, WI · Accident · Minor injuries · Class 4 · Limited · Final report · Aug 14, 2024 · N3613W · Substantial damage
  > The pilot’s improper landing flare and hard landing.
- [NTSB CEN19LA071](https://openairdocs.org/ntsb/CEN19LA071.md): Piper PA24 · Beechwood, WI · Accident · Minor injuries · Class 3 · Limited · Final report · Jan 18, 2019 · N6497P · Substantial damage
  > A partial loss of engine power for reasons that could not be determined based on the available information.
- [NTSB CEN18LA158](https://openairdocs.org/ntsb/CEN18LA158.md): Robinson Helicopter R44 · East Troy, WI · Accident · No injuries · Class 3 · Limited · Final report · May 4, 2018 · N444VH · Substantial damage
  > A partial loss of engine power for reasons that could not be determined based on the available information, which resulted in impact with terrain and dynamic rollover during the subsequent attempted landing.
- [NTSB GAA17CA491](https://openairdocs.org/ntsb/GAA17CA491.md): Robinson Helicopter R44 · Westby, WI · Accident · No injuries · Data collection · Final report · Aug 14, 2017 · N97UP · Substantial damage
  > The pilot's failure to see and avoid power lines while maneuvering at low altitude.
- [NTSB CEN16LA255](https://openairdocs.org/ntsb/CEN16LA255.md): Piper PA 25-235 · Arlington, WI · Accident · Minor injuries · Limited investigation · Final report · Jul 3, 2016 · N6803Z · Substantial damage
  > The pilot’s failure to establish proper airspeed and angle-of-attack during takeoff with the airplane at its maximum gross weight in elevated density altitude and gusting tailwind conditions, which resulted in an aerodynamic stall.
- [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 CEN14CA344](https://openairdocs.org/ntsb/CEN14CA344.md): Piper PA 25-235 · Rhinelander, WI · Accident · Minor injuries · Data collection · Final report · Jul 3, 2014 · N8730L · Substantial damage
  > A loss of engine power due to the pilot's improper inflight planning and reliance of fuel gauge readings, which resulted in fuel exhaustion.
- [NTSB CHI08LA124](https://openairdocs.org/ntsb/CHI08LA124.md): Piper PA-25-235 · New Lisbon, WI · Accident · 1 fatal · Limited investigation · Final report · May 5, 2008 · N4352Y · Substantial damage
  > The pilot's failure to maintain adequate altitude during a course reversal at the completion of an agricultural spray run.
- [NTSB CHI06FA128](https://openairdocs.org/ntsb/CHI06FA128.md): Robinson R44 · East Troy, WI · Accident · Serious injuries · Field investigation · Final report · May 13, 2006 · N442GS · Substantial damage
  > The pilot's failure to calculate the weight and balance of the helicopter prior to flight, his failure to recognize and correct the forward center of gravity condition and his failure to abort the takeoff. A factors was the pilot's improper decision to…
- [NTSB CHI05FA274](https://openairdocs.org/ntsb/CHI05FA274.md): Robinson R44 · Drummond, WI · Accident · 3 fatal · Field investigation · Final report · Sep 24, 2005 · N9158U · Substantial damage
  > Clearance not obtained/maintained by the pilot during an unknown phase of flight. Contributing factors were the improper use of procedures by the pilot, the inadequate surveillance of the operation by company/management, and the wire.
- [NTSB CHI03LA272](https://openairdocs.org/ntsb/CHI03LA272.md): Piper PA-25 · Brandon, WI · Accident · No injuries · Limited investigation · Final report · Aug 19, 2003 · N4346Y · Substantial damage
  > The pilot failed to maintain clearance from the corn crop during an aerial application maneuver. Additional factors were the terrain induced turbulence and the corn crop.
- [NTSB CHI02FA049](https://openairdocs.org/ntsb/CHI02FA049.md): Robinson R44 · Waukesha, WI · Accident · 1 fatal · Field investigation · Final report · Dec 13, 2001 · N7007F · Destroyed
  > The pilot's continued flight into adverse weather and not maintaining altitude/clearance from the static line during cruise flight. Factors were the static wire, the darkness of night, the low ceiling, and the vehicle.
- [NTSB CHI97LA244](https://openairdocs.org/ntsb/CHI97LA244.md): Piper PA-24-250 · Fond Du Lac, WI · Accident · Minor injuries · Limited investigation · Final report · Aug 2, 1997 · N720MB · Substantial damage
  > the pilot's improper use of the throttle control friction lock, and his inadequate remedial action. Related factors were his lack of experience in type of aircraft, the pilot's habit interference, and the presence of parked (standing) aircraft.
- [NTSB CHI96LA003](https://openairdocs.org/ntsb/CHI96LA003.md): Piper PA-28-236 · Thorp, WI · Accident · No injuries · Limited investigation · Final report · Oct 9, 1995 · N9090X · Substantial damage
  > the pilot's failure to abort the takeoff and the premature liftoff which resulted in an inadvertent stall. Factors relating to this accident are improper planning and decision by the pilot, and the tall, wet grass.
- [NTSB CHI91DEP05](https://openairdocs.org/ntsb/CHI91DEP05.md): Piper PA-25-235 · Neenah, WI · Accident · No injuries · Final report · May 27, 1991 · N855SD · Substantial damage
  > The pilot in command's failure to attain sufficient airspeed to achieve flight, and his failure to abort the takeoff.
- [NTSB CHI88DEP10](https://openairdocs.org/ntsb/CHI88DEP10.md): Piper PA-25-235 · Beaver Dam, WI · Accident · No injuries · Final report · Aug 11, 1988 · N4856Y · Substantial damage
  > While in cruise flight the aircraft experienced a total loss of power due to fuel exhaustion. The pilot stated that there were no good landing areas available, so he elected to make the emergency landing in a marsh. The aircraft landed hard and sustained…
- [NTSB CHI87LA082](https://openairdocs.org/ntsb/CHI87LA082.md): Piper PA-28-235 · Oshkosh, WI · Accident · No injuries · Limited investigation · Final report · Feb 12, 1987 · N9451W · Substantial damage
  > According to the plt, at aprx 1800 feet 'the engine abruptly quit with no runon or sputter' following takeoff from rwy 18 at Oshkosh, WI. The plt stated that he banked the acft back to the airport, but the aileron controls became jammed or 'frozen'. According…
- [NTSB CHI86FA194](https://openairdocs.org/ntsb/CHI86FA194.md): Piper PA-24-250 · Oshkosh, WI · Accident · Serious injuries · Field investigation · Final report · Aug 2, 1986 · N5713P · Substantial damage
  > The aircraft ran out of fuel after 3+41 hours of flight. The pilot stated that he was sure the tanks were full on takeoff. Flight planning and a documented conservative fuel burn rate indicated that the aircraft should have been able to remain airborne for at…
- [NTSB CHI85FA176](https://openairdocs.org/ntsb/CHI85FA176.md): Cessna R182 · Prairie Dusac, WI · Accident · 1 fatal · Field investigation · Final report · Apr 26, 1985 · N4707T · 2 aircraft · Substantial damage
  > This midair collision occurred approx 2 mi NE of sauk-Prairie apt. The pilots of the Cessna were in a climbing right departure turn at approx 1600 ft MSL heading approx 120 deg when a collsion occurred with a Piper heading approx 270 deg and descending. One…
- [NTSB CHI84LA386](https://openairdocs.org/ntsb/CHI84LA386.md): Piper PA25 · Sheboygan, WI · Accident · No injuries · Limited investigation · Final report · Sep 7, 1984 · N4571Y · Substantial damage
  > Plt initiated takeoff in strong gusty x-wind. Approaching tree line, acft began to sink. Plt turned to avoid trees and stalled acft. Load jettison was too late to aid in stall recovery and acft mushed into ground.
- [NTSB CHI83LA219](https://openairdocs.org/ntsb/CHI83LA219.md): Piper PA25 · Tomah, WI · Accident · No injuries · Limited investigation · Final report · May 17, 1983 · N4521Y · Substantial damage
  > The acft lost power and made a forced landing immediately after takeoff on an aerial application mission. The landing gear collapsed during the landing. The pilot stated that the accident occurred on the 5th flt of the day after taking off on runway 27 and…
- [NTSB CHI82DEP04](https://openairdocs.org/ntsb/CHI82DEP04.md): Cessna TR182 · Lake Geneva, WI · Accident · No injuries · Closed · Oct 3, 1981 · N736WH · Substantial damage
- [NTSB CHI80FEP58](https://openairdocs.org/ntsb/CHI80FEP58.md): Piper PA-25 · Evansville, WI · Accident · No injuries · Closed · Sep 26, 1980 · N7627Z · Substantial damage
- [NTSB CHI80DEP50](https://openairdocs.org/ntsb/CHI80DEP50.md): Piper PA-32 · Dodgeville, WI · Accident · No injuries · Closed · Aug 9, 1980 · N3954W · Substantial damage
- [NTSB CHI79FEP24](https://openairdocs.org/ntsb/CHI79FEP24.md): Piper PA-32 · Milwaukee, WI · Accident · No injuries · Closed · Jan 29, 1979 · N4823S · Substantial damage
- [NTSB CHI79DEP17](https://openairdocs.org/ntsb/CHI79DEP17.md): Piper PA-24 · Eau Claire, WI · Accident · No injuries · Closed · Dec 28, 1978 · N6175P · Substantial damage
- [NTSB CHI78FEP05](https://openairdocs.org/ntsb/CHI78FEP05.md): Piper PA-24 · Green Bay, WI · Accident · No injuries · Closed · Oct 19, 1977 · N5837P · Substantial damage
- [NTSB CHI77FER04](https://openairdocs.org/ntsb/CHI77FER04.md): Piper PA-24 · Superior, WI · Accident · 1 fatal · Closed · Jul 4, 1977 · N8898 · Substantial damage
- [NTSB CHI77FEP13](https://openairdocs.org/ntsb/CHI77FEP13.md): Piper PA-28 · Cable, WI · Accident · No injuries · Closed · Dec 24, 1976 · N210KB · Substantial damage
- [NTSB CHI76DEP25](https://openairdocs.org/ntsb/CHI76DEP25.md): Cessna 182 · Milwaukee, WI · Accident · No injuries · Closed · Feb 6, 1976 · N3142R · Substantial damage
- [NTSB CHI75DEP72](https://openairdocs.org/ntsb/CHI75DEP72.md): Piper PA-24 · Sturgeon Bay, WI · Accident · No injuries · Closed · Jun 20, 1975 · N5837P · Substantial damage
- [NTSB CHI74DEP35](https://openairdocs.org/ntsb/CHI74DEP35.md): Piper PA-32 · Racine, WI · Accident · No injuries · Closed · Feb 17, 1974 · N3303W · Substantial damage
- [NTSB CHI73FEP73](https://openairdocs.org/ntsb/CHI73FEP73.md): Piper PA-24 · Burlington, WI · Accident · No injuries · Closed · Oct 4, 1972 · N6459P · Substantial damage
- [NTSB CHI73FEP10](https://openairdocs.org/ntsb/CHI73FEP10.md): Piper PA-25 · Suring, WI · Accident · Serious injuries · Closed · Sep 12, 1972 · N4598Y · Substantial damage
- [NTSB CHI71DEP52](https://openairdocs.org/ntsb/CHI71DEP52.md): Piper PA-25 · Random Lake, WI · Accident · No injuries · Closed · May 28, 1971 · N4421Y · Substantial damage
- [NTSB CHI70FDM07](https://openairdocs.org/ntsb/CHI70FDM07.md): Piper PA-28 · Minong, WI · Accident · No injuries · Closed · Jun 17, 1970 · N8659W · Substantial damage
- [NTSB CHI70F0333](https://openairdocs.org/ntsb/CHI70F0333.md): Piper PA-24 · Sextonville, WI · Accident · Minor injuries · Closed · Aug 30, 1969 · N7797P · Substantial damage
- [NTSB CHI70D0095](https://openairdocs.org/ntsb/CHI70D0095.md): Piper PA-25 · Suring, WI · Accident · No injuries · Closed · Jul 8, 1969 · N4598Y · Substantial damage
- [NTSB CHI69F0496](https://openairdocs.org/ntsb/CHI69F0496.md): Piper PA-24 · Eau Claire, WI · Accident · No injuries · Closed · Feb 26, 1969 · N6860P · Substantial damage
- [NTSB CHI68F0125](https://openairdocs.org/ntsb/CHI68F0125.md): Piper PA-28 · Three Lakes, WI · Accident · Minor injuries · Closed · Jul 15, 1967 · N8956W · Substantial damage
- [NTSB CHI67D0598](https://openairdocs.org/ntsb/CHI67D0598.md): Piper PA-24 · Eagle River, WI · Accident · No injuries · Closed · Mar 4, 1967 · N5289P · Substantial damage
- [NTSB CHI67F0472](https://openairdocs.org/ntsb/CHI67F0472.md): Piper PA-24 · Eau Claire, WI · Accident · No injuries · Closed · Feb 7, 1967 · N6538P · Substantial damage
- [NTSB CHI67D0592](https://openairdocs.org/ntsb/CHI67D0592.md): Piper PA-24 · Milwaukee, WI · Accident · No injuries · Closed · Feb 6, 1967 · N7782P · Substantial damage
- [NTSB CHI67F0030](https://openairdocs.org/ntsb/CHI67F0030-201482.md): Piper PA24 · Delavan, WI · Accident · No injuries · Closed · Jun 27, 1966 · N8217P · Substantial damage
- [NTSB CHI66D0493](https://openairdocs.org/ntsb/CHI66D0493.md): Piper PA-24 · Crivitz, WI · Accident · No injuries · Closed · Aug 20, 1965 · N5630P · Substantial damage

## 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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41532'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41532&state=WI

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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.