# NTSB investigations: Lycoming IO-540-AB1A5: 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 ANC26FA039](https://openairdocs.org/ntsb/ANC26FA039.md): Cessna 182T · Armistead, CA · Accident · 2 fatal · Class 3 · Field · Preliminary report · May 7, 2026 · N227TF · Substantial damage
  > On May 7, 2026, about 1055 pacific daylight time (PDT), a Cessna 182T airplane, N227TF, was destroyed when it was involved in an accident near Armistead, California. The flight instructor and the pilot receiving instruction were fatally injured. The airplane…
- [NTSB GAA26WA014](https://openairdocs.org/ntsb/GAA26WA014.md): Textron 182T · Nuuk, Greenland · Accident · 1 fatal · Class 5 · Foreign · Oct 25, 2025 · N9009F · Destroyed

## 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 ('41808')
    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=41808

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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.