# NTSB investigations: Air Tractor AT-401: Off-field or emergency landing

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 CEN14LA439](https://openairdocs.org/ntsb/CEN14LA439.md): Air Tractor AT-401 · Wray, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 19, 2014 · N4542W · Substantial damage
  > A loss of the No. 1 cylinder’s compression due to a stuck exhaust valve caused by a lack of sufficient valve clearance, which resulted in a loss of engine power and a forced landing. Contributing to the loss of engine power were the worn intake and exhaust…
- [NTSB CEN13LA152](https://openairdocs.org/ntsb/CEN13LA152.md): Air Tractor AT-401 · Victoria, TX · Accident · No injuries · Limited investigation · Final report · Jan 31, 2013 · N9190B · Substantial damage
  > The mechanical failure of the engine power section, which resulted in a loss of engine power.
- [NTSB CHI08CA213](https://openairdocs.org/ntsb/CHI08CA213.md): Air Tractor AT-401 · Ida Grove, IA · Accident · No injuries · Data collection · Final report · Aug 12, 2008 · N45029 · Substantial damage
  > A failure of the turbocharger blower which resulted in the partial loss of power. Factors associated with the accident were the low altitude of the airplane and the embankment.

## 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.aircraft_model_code IN ('0390204', '0390209')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s.case_mkey = x.case_mkey AND s.aircrafts_position = x.position AND s."tier2Number" = '440' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent")))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/440/sequence?model=0390204

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