# NTSB investigations: Pratt & Whitney PT6A-27 series

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 WPR25LA038](https://openairdocs.org/ntsb/WPR25LA038.md): Dehavilland DHC-6-300 · Boulder City, NV · Accident · No injuries · Class 3 · Limited · Final report · Nov 15, 2024 · N241SA · Substantial damage
  > A loss of directional control during the landing roll in gusting crosswind conditions.
- [NTSB ERA22LA255](https://openairdocs.org/ntsb/ERA22LA255.md): Air Tractor AT-400A · Pemberton Township, NJ · Accident · No injuries · Class 4 · Limited · Final report · Jun 1, 2022 · N3658T · Substantial damage
  > The pilot’s improper landing flare, which resulted in a hard, bounced landing and a subsequent loss of control.
- [NTSB WPR20CA112](https://openairdocs.org/ntsb/WPR20CA112.md): De Havilland DHC6 · Boulder City, NV · Accident · No injuries · Data collection · Final report · Mar 6, 2020 · N72GC · Substantial damage
  > The trainee pilot's loss of directional control during landing and his subsequent unintentional control interference with the brakes and/or rudder during the trainer pilot's attempted remedial action, which resulted in a runway excursion and collision with a…
- [NTSB ANC18LA027](https://openairdocs.org/ntsb/ANC18LA027.md): Dehavilland DHC 6 Twin Otter · Arctic Ocean · Accident · Serious injuries · Limited investigation · Final report · Mar 21, 2018 · N716JP · Substantial damage
  > The flight crew's improper decision to deliberately operate the airplane at low altitude and along a flightpath that resulted in a collision with a pedestrian after takeoff. Contributing to the accident was the pedestrian's proximity to the runway.
- [NTSB CEN17LA330](https://openairdocs.org/ntsb/CEN17LA330.md): Air Tractor AT 401 · Pearsall, TX · Accident · No injuries · Limited investigation · Final report · Aug 24, 2017 · N4532F · Substantial damage
  > The fatigue crack of an engine cylinder, which resulted in a partial loss of engine power.
- [NTSB ERA15LA343](https://openairdocs.org/ntsb/ERA15LA343.md): Dehavilland DHC-6 · Louisburg, NC · Accident · Serious injuries · Limited investigation · Final report · Sep 6, 2015 · N181CS · Substantial damage
  > The propeller’s movement to the beta position during landing for reasons that could not be determined during postaccident examination and testing, which resulted in an attempted go-around and subsequent loss of airplane control.
- [NTSB CEN13LA239](https://openairdocs.org/ntsb/CEN13LA239.md): Air Tractor AT-301 · Bowling Green, MO · Accident · No injuries · Limited investigation · Final report · Apr 24, 2013 · N23416 · Substantial damage
  > The failure of the engine supercharger's rear bearing, which resulted in the loss of engine power.
- [NTSB ENG11IA032](https://openairdocs.org/ntsb/ENG11IA032.md): Dehavilland DHC-6-300 · Peach Springs, AZ · Incident · No injuries · Incident investigation · Final report · May 21, 2011 · N178GC · No damage
  > A quality control failure in the Sungear, Inc. manufacturing and quality control process allowed sungears with surface finishes of the root fillet radius of the spline that did not conform to the drawing specifications to be released. The surface finish…
- [NTSB DEN00FA085](https://openairdocs.org/ntsb/DEN00FA085.md): de Havilland DHC-6-300 · Monument Valley, UT · Accident · No injuries · Field investigation · Final report · May 5, 2000 · N241SA · Substantial damage
  > The pilot-in-command's failure to maintain directional control. A factor was wind shear.
- [NTSB ANC99LA064](https://openairdocs.org/ntsb/ANC99LA064.md): de Havilland DHC-6-300 · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · May 25, 1999 · N72GC · Substantial damage
  > An in-flight collision with a bird.
- [NTSB FTW91DRD04](https://openairdocs.org/ntsb/FTW91DRD04.md): Air Tractor AT 301 · Lake Providence, LA · Accident · Serious injuries · Final report · May 10, 1991 · N3658T · Substantial damage
  > A loss of engine power for undetermined reasons resulting in a forced landing and nose over on landing.
- [NTSB SEA79DYA27](https://openairdocs.org/ntsb/SEA79DYA27.md): Air Tractor AT-301 · Newdale, ID · Accident · No injuries · Closed · Aug 10, 1979 · N8791S · Substantial damage

## 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 ('52141'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=52141

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