# NTSB investigations: Lycoming IO-540 series, WY

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 WPR26LA083](https://openairdocs.org/ntsb/WPR26LA083.md): Robinson R44 · Parkman, WY · Accident · No injuries · Class 4 · Limited · Final report · Jan 19, 2026 · N996NR · 2 aircraft · Substantial damage
  > The pilots’ failure to maintain separation while conducting air work in a common operational area. Contributing to the accident was the pilots’ divided attention associated with the mission activity and unreliable radio communications.
- [NTSB WPR26LA084](https://openairdocs.org/ntsb/WPR26LA084.md): Maule M-7-235B · Cody, WY · Accident · No injuries · Class 4 · Limited · Final report · Jan 17, 2026 · N116G · Substantial damage
  > The pilot's failure to maintain directional control during landing roll.
- [NTSB WPR23FA137](https://openairdocs.org/ntsb/WPR23FA137.md): Cessna 182S · Alcova, WY · Accident · 1 fatal · Class 3 · Field · Final report · Mar 21, 2023 · N314FR · Substantial damage
  > The airplane’s encounter with low level wind shear associated with moderate turbulence, which resulted in a loss of airplane control.
- [NTSB WPR23LA108](https://openairdocs.org/ntsb/WPR23LA108.md): Maule M-7-260C · Lander, WY · Accident · No injuries · Class 4 · Limited · Final report · Feb 7, 2023 · N4045R · Substantial damage
  > The pilot’s failure to maintain directional control during landing.
- [NTSB WPR22LA187](https://openairdocs.org/ntsb/WPR22LA187.md): Twenty Second Street Backcountry Boss · Douglas, WY · Accident · Minor injuries · Class 4 · Limited · Final report · May 16, 2022 · N829PW · Substantial damage
  > The pilot’s inadequate flare and subsequent loss of airplane control during landing.
- [NTSB GAA18CA462](https://openairdocs.org/ntsb/GAA18CA462.md): Piper PA24 · Evanston, WY · Accident · No injuries · Data collection · Final report · Jul 29, 2018 · N7893P · Substantial damage
  > The pilot's failure to extend the landing gear during landing. Contributing to the accident were the pilot's distraction and his failure to complete the appropriate checklist before landing.
- [NTSB GAA15CA291](https://openairdocs.org/ntsb/GAA15CA291.md): Maule M 7-235C · Kemmerer, WY · Accident · No injuries · Data collection · Final report · Sep 30, 2015 · N4244L · Substantial damage
  > A hard landing which resulted in a loss directional control and ground loop.
- [NTSB WPR11FA082](https://openairdocs.org/ntsb/WPR11FA082.md): Aero Commander 114B · Lander, WY · Accident · 3 fatal · Field investigation · Final report · Dec 22, 2010 · N799RS · Substantial damage
  > The non-instrument-rated pilot's decision to continue visual flight in instrument or marginal visual meteorological conditions in mountainous terrain, which resulted in controlled flight into terrain. Contributing to the accident was the pilot's lack of…
- [NTSB LAX08CA249](https://openairdocs.org/ntsb/LAX08CA249.md): Fowler SX300 · Cheyenne, WY · Accident · No injuries · Data collection · Final report · Jul 30, 2008 · N99F · Substantial damage
  > Loss of engine power due to fuel starvation.
- [NTSB DEN05CA138](https://openairdocs.org/ntsb/DEN05CA138.md): Robinson R44 II · Jackson, WY · Accident · No injuries · Data collection · Final report · Sep 9, 2005 · N944U · Substantial damage
  > the pilot's failure to maintain aircraft control during initial takeoff climb resulting in an uncontrolled descent and impact with terrain. A contributing factor was the pilot's encounter in settling with power.
- [NTSB DEN04CA125](https://openairdocs.org/ntsb/DEN04CA125.md): Maule M-6-235 · Dubois, WY · Accident · Minor injuries · Data collection · Final report · Aug 16, 2004 · N167MC · Substantial damage
  > the pilot's misjudgment of altitude/distance resulting in an undershoot of the runway.
- [NTSB DEN01LA149](https://openairdocs.org/ntsb/DEN01LA149.md): Piper PA-32RT-300 · Rock Springs, WY · Accident · No injuries · Limited investigation · Final report · Aug 18, 2001 · N3015L · Substantial damage
  > the mechanic's failure to perform an airworthiness directive, which resulted in the loss of engine oil through a partially failed oil filter converter plate gasket, and subsequent failure of a connecting rod during cruise flight. A contributing factor was the…
- [NTSB SEA93LA203](https://openairdocs.org/ntsb/SEA93LA203.md): Maule M-7-235 · Recluse, WY · Accident · No injuries · Limited investigation · Final report · Sep 20, 1993 · N61043 · Substantial damage
  > The brake system locked for undetermined reasons.
- [NTSB SEA92LA078](https://openairdocs.org/ntsb/SEA92LA078.md): Maule M-7 · Aravada, WY · Accident · No injuries · Limited investigation · Final report · Apr 14, 1992 · N61043 · Substantial damage
  > The pilot's failure to maintain a visual lookout, and his diverted attention. Factors include a low pass, and a transmission wire in the path of flight.
- [NTSB SEA90LA147](https://openairdocs.org/ntsb/SEA90LA147.md): Lake LA-250 · Rawlins, WY · Accident · Minor injuries · Limited investigation · Final report · Jul 27, 1990 · N14004 · Substantial damage
  > Pilot's improper planning/decision, and his misjudgement of the aircraft's climb capability in conditions of high density altitude and unanticipated atmospheric conditions. The high density altitude and rising terrain were related factors.

## 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" = 'WY' 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 ('41530', '41585'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41530&state=WY

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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.