# Fatal 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 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 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 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 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 CHI77FER04](https://openairdocs.org/ntsb/CHI77FER04.md): Piper PA-24 · Superior, WI · Accident · 1 fatal · Closed · Jul 4, 1977 · N8898 · 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."highestInjuryLevel" = 'Fatal'
  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&fatal=1&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.