# NTSB investigations: Pratt & Whitney Canada PT6A-34AG: Aerodynamic stall/spin

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 ERA21FA257](https://openairdocs.org/ntsb/ERA21FA257.md): Air Tractor AT-402B · Kinston, NC · Accident · 1 fatal · Class 3 · Field · Final report · Jun 18, 2021 · N402SJ · Destroyed
  > The pilot’s decision to conduct low-level aerobatic maneuvers in an airplane not approved for aerobatic flight, which resulted in an aerodynamic stall and spin, a loss of control, and an impact with terrain.
- [NTSB GAA19CA339](https://openairdocs.org/ntsb/GAA19CA339.md): Air Tractor AT502 · San Benito, TX · Accident · No injuries · Data collection · Final report · Jun 13, 2019 · N103CK · Substantial damage
  > The pilot's improper decision to take off with the airplane near its maximum allowable gross takeoff weight and his subsequent exceedance of the airplane's critical angle of attack during takeoff, which resulted in an aerodynamic stall.
- [NTSB CEN18FA339](https://openairdocs.org/ntsb/CEN18FA339.md): Air Tractor AT502 · Bronson, MI · Accident · 1 fatal · Field investigation · Final report · Aug 18, 2018 · N502RL · Destroyed
  > The pilot's failure to maintain airspeed while maneuvering, which resulted in exceedance of the airplane's critical angle of attack, an aerodynamic stall, and loss of control at an altitude too low for recovery.
- [NTSB CEN13LA391](https://openairdocs.org/ntsb/CEN13LA391.md): Air Tractor AT-402B · Ipswich, SD · Accident · No injuries · Limited investigation · Final report · Jul 2, 2013 · N2072D · Substantial damage
  > The pilot’s failure to obtain adequate airspeed during the takeoff roll, which resulted in an aerodynamic stall.

## 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 ('52251')
    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" = '241'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/241/cases?engine=52251

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