# NTSB investigations: Lycoming IO-540 series: Unknown or undetermined

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 GAA26WA181](https://openairdocs.org/ntsb/GAA26WA181.md): Piper PA-23-250 · Cumayasa, La Romana, Dominican Republic · Incident · No injuries · Class 5 · Foreign · Apr 29, 2026 · N63941 · Substantial damage
- [NTSB CEN26FA147](https://openairdocs.org/ntsb/CEN26FA147.md): Experimental Homebuilt Airshark · Statesboro, GA · Accident · 1 fatal · Class 3 · Field · Preliminary report · Mar 25, 2026 · N220AS · Substantial damage
  > On March 25, 2026, about 1453 eastern daylight time, an experimental homebuilt Airshark airplane, N220AS, was substantially damaged when it was involved in an accident near Statesboro, Georgia. The pilot was fatally injured. The airplane was operated as a…
- [NTSB ERA23LA359](https://openairdocs.org/ntsb/ERA23LA359.md): Aero Commander 500 S · Key West, FL · Accident · No injuries · Class 4 · Limited · Final report · Aug 13, 2023 · N62WE · Substantial damage
  > A total loss of engine power for reasons that could not be determined.
- [NTSB CEN23LA268](https://openairdocs.org/ntsb/CEN23LA268.md): Velocity Velocity XL · Tahlequah, OK · Accident · Serious injuries · Class 3 · Limited · Final report · Jun 27, 2023 · N340XL · Substantial damage
  > A total loss of engine power for undetermined reasons.
- [NTSB ERA23LA148](https://openairdocs.org/ntsb/ERA23LA148.md): Velocity Velocity SE · Bahia Key, FL · Accident · Serious injuries · Class 3 · Limited · Final report · Mar 11, 2023 · N343BD · Substantial damage
  > A total loss of engine power for undetermined reasons.
- [NTSB CEN23LA022](https://openairdocs.org/ntsb/CEN23LA022.md): Piper PA-32R-300 · Evansville, IN · Accident · Serious injuries · Class 3 · Limited · Final report · Oct 30, 2022 · N349SB · Substantial damage
  > The total loss of engine power for reasons that could not be determined based on the available evidence.
- [NTSB ERA22LA366](https://openairdocs.org/ntsb/ERA22LA366.md): Piper PA-32RT · Wilmington, NC · Accident · Minor injuries · Class 3 · Limited · Final report · Jun 29, 2022 · N4321M · Substantial damage
  > A partial loss of engine power during initial climb for reasons that could not be determined.
- [NTSB CEN22LA247](https://openairdocs.org/ntsb/CEN22LA247.md): Piper PA-32R-301 · Olla, LA · Accident · Minor injuries · Class 3 · Limited · Final report · Jun 9, 2022 · N416TS · Substantial damage
  > The partial loss of engine power for undetermined reasons.
- [NTSB WPR22LA127](https://openairdocs.org/ntsb/WPR22LA127.md): Piper PA-32R-300 · St. George, UT · Accident · Serious injuries · Class 3 · Limited · Final report · Mar 24, 2022 · N111NW · Substantial damage
  > The total loss of engine power for undetermined reasons.
- [NTSB CEN21LA321](https://openairdocs.org/ntsb/CEN21LA321.md): Swann Lynn J Seawind 3000 · Charlevoix, MI · Accident · No injuries · Class 4 · Limited · Final report · Jul 3, 2021 · N8UU · Destroyed
  > The loss of engine power for undetermined reasons based on available evidence.
- [NTSB WPR20FA013](https://openairdocs.org/ntsb/WPR20FA013.md): Robinson R44 · Las Vegas, NV · Accident · 2 fatal · Class 3 · Field · Final report · Oct 23, 2019 · N225JM · Substantial damage
  > An undetermined inflight event that resulted in the pilot performing an autorotation to uneven terrain for reasons that could not be determined due to the extent of impact damage.
- [NTSB CEN20LA021](https://openairdocs.org/ntsb/CEN20LA021.md): Piper PA23 · (Gulf of Mexico) · Accident · 1 fatal · Class 3 · Limited · Final report · Oct 17, 2019 · N778PA · Destroyed
  > The airplane’s descent into the ocean for reasons that could not be determined.
- [NTSB WPR19FA188](https://openairdocs.org/ntsb/WPR19FA188.md): Robinson R44 · Hayward, CA · Accident · 1 fatal · Class 3 · Field · Final report · Jul 15, 2019 · N144TG · Substantial damage
  > The pilots’ loss of control during a low altitude maneuver for undetermined reasons, which resulted in impact with terrain.
- [NTSB CEN18LA069](https://openairdocs.org/ntsb/CEN18LA069.md): Robinson Helicopter R44 II · Albany, TX · Accident · No injuries · Limited investigation · Final report · Jan 8, 2018 · N797JR · Substantial damage
  > A loss of helicopter control for reasons that could not be determined because postaccident examination did not reveal any evidence of mechanical malfunctions or failures of the main rotor and tail rotor systems that would have precluded normal operation.
- [NTSB ERA15WA355](https://openairdocs.org/ntsb/ERA15WA355.md): Smith AEROSTAR600 · Santa Fé de Antioquia, Colombia · Accident · 2 fatal · Foreign investigation · Sep 11, 2015 · N164HH · Destroyed
- [NTSB ERA14WA148](https://openairdocs.org/ntsb/ERA14WA148.md): Zivko Aeronautics Edge 540T · Al Khor, Qatar · Accident · 1 fatal · Foreign investigation · Mar 7, 2014 · N149WA · Substantial damage
  > On March 17, 2014, about 1725 local time, a Zivko Aeronautics Edge 540T, N149WA, was substantially damaged when it collided with the ground during an airshow performance at Al Khor Airport (OTBK), Al Khor, Qatar. The commercial pilot was fatally injured. The…
- [NTSB ERA13FA109](https://openairdocs.org/ntsb/ERA13FA109.md): Benton Fred D Seawind 3000 · Sarasota, FL · Accident · 2 fatal · Field investigation · Final report · Jan 12, 2013 · N829GS · Destroyed
  > The pilot's inability to establish a normal climb rate after takeoff for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB ERA09LA410](https://openairdocs.org/ntsb/ERA09LA410.md): Robinson R44 · Silver Spring, PA · Accident · No injuries · Limited investigation · Final report · Jul 19, 2009 · N25VH · Substantial damage
  > The student pilot's inability to fully control the helicopter, during cruise and the resultant off-field hard landing.

## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41530', '41585')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '000'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/000/cases?engine=41530

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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.