# NTSB investigations: AiResearch TPE331 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 WPR26FA309](https://openairdocs.org/ntsb/WPR26FA309.md): Cessna 441 · Cape Newenham, AK · Accident · 8 fatal · Class 3 · Field · Preliminary report · Aug 20, 2026 · N128EZ · Destroyed
  > On August 20, 2026, at about 1145 Alaska daylight time, a Cessna 441, N128EZ, was destroyed when it was involved in an accident near Cape Newenham, Alaska. The two pilots and six passengers were fatally injured. The airplane was operated as a Title 14 Code of…
- [NTSB ERA25FA246](https://openairdocs.org/ntsb/ERA25FA246.md): Cessna 441 · Warren, OH · Accident · 6 fatal · Class 3 · Field · Preliminary report · Jun 29, 2025 · N441LS · Substantial damage
  > On June 29, 2025, about 0654 eastern daylight time, a Cessna 441, N441LS, was destroyed when it was involved in an accident near Warren, Ohio. The airline transport pilot and five passengers were fatally injured. The airplane was operated as a Title 14 Code…
- [NTSB WPR25MA128](https://openairdocs.org/ntsb/WPR25MA128.md): Mitsubishi MU-2B-40 · Copake, NY · Accident · 6 fatal · Class 3 · Major · Preliminary report · Apr 12, 2025 · N635TA · Destroyed
  > On April 12, 2025, about 1203 eastern daylight time, a Mitsubishi MU-2B-40, N635TA, was destroyed when it was involved in an accident near Copake, New York. The pilot and five passengers were fatally injured. The airplane was operated as a Title 14 Code of…
- [NTSB CEN20LA215](https://openairdocs.org/ntsb/CEN20LA215.md): Mitsubishi MU2B · Sioux Falls, SD · Accident · 1 fatal · Class 3 · Limited · Final report · Jun 7, 2020 · N44MX · Destroyed
  > The pilot’s failure to maintain control of the airplane during takeoff for reasons that could not be determined.

## 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 ('01514', '01517')
    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=01514

---
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.