# NTSB investigations: Lycoming T-53 series, AK

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 ANC22FA047](https://openairdocs.org/ntsb/ANC22FA047.md): Bell UH1B · Clear, AK · Accident · 1 fatal · Class 3 · Field · Final report · Jun 27, 2022 · N9970F · Destroyed
  > A loss of control for reasons that could not be determined based on the available information.
- [NTSB GAA19CA345](https://openairdocs.org/ntsb/GAA19CA345.md): S M & T UH · Northway, AK · Accident · Serious injuries · Data collection · Final report · Jun 10, 2019 · N64771 · Substantial damage
  > The pilot's failure to maintain a proper descent rate during landing, which resulted in impact with terrain.
- [NTSB ANC93FA056](https://openairdocs.org/ntsb/ANC93FA056.md): Bell 204B · Copper Harbor, AK · Accident · 1 fatal · Field investigation · Final report · May 2, 1993 · N204AQ · Destroyed
  > Fatigue failure of the tail rotor gearbox, and improper helicopter operations being conducted by the operator resulting in repetitive at and over maximum loads. Factors in the accident were: material defect of the tail rotor gear box (inadequate quality…
- [NTSB ANC91LA058](https://openairdocs.org/ntsb/ANC91LA058.md): Bell UH-1B · Dog Fish Bay, AK · Accident · 1 fatal · Limited investigation · Final report · May 21, 1991 · N87966 · Destroyed
  > The pilot's exceeding the gross weight of the aircraft and inadequate supervision by company management. Contributing to the accident was the high vegetation.

## 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" = 'AK' 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 ('41552', '41549', '41587'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=41552&state=AK

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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.