# NTSB investigations: Air Tractor AT-401: Loss of engine power(total) - mech failure/malf

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 DFW05IA222](https://openairdocs.org/ntsb/DFW05IA222.md): Air Tractor AT-401 · Winnie, TX · Incident · No injuries · Incident investigation · Final report · Aug 19, 2005 · N4545W · Minor damage
  > The loss of engine power due to the failure of the second-stage turbine wheel as a result of low cycle fatigue.
- [NTSB CHI03LA095](https://openairdocs.org/ntsb/CHI03LA095.md): Air Tractor AT-401 · Knox, IN · Accident · Serious injuries · Limited investigation · Final report · Mar 31, 2003 · N45297 · Substantial damage
  > A loss of engine power due to oil starvation as a result of the failure of the master rod bearing. Contributing factors were the tree line at the edge of the field, and the unsuitable terrain.
- [NTSB FTW01LA178](https://openairdocs.org/ntsb/FTW01LA178.md): Air Tractor AT-401 · Grand Coteau, LA · Accident · No injuries · Limited investigation · Final report · Aug 9, 2001 · N10140 · Substantial damage
  > the loss of engine power while maneuvering, which resulted from a fractured #4 cylinder head at the exhaust valve rocker arm boss. A contributing factor was the lack of suitable terrain for the forced landing.
- [NTSB CHI01LA135](https://openairdocs.org/ntsb/CHI01LA135.md): Air Tractor AT-401 · Warsaw, IL · Accident · No injuries · Limited investigation · Final report · May 12, 2001 · N1008Q · Substantial damage
  > the rocker assembly failure during low level maneuvering. Factors were the soft and sandy terrain and the unsuitable terrain the pilot encountered during the forced landing.
- [NTSB FTW00LA074](https://openairdocs.org/ntsb/FTW00LA074.md): Air Tractor AT-401 · Rayville, LA · Accident · No injuries · Limited investigation · Final report · Jan 25, 2000 · N91968 · Substantial damage
  > The loss of engine power due to a crack in the #6 cylinder. A factor was the lack of suitable terrain for the forced landing.
- [NTSB ATL99LA129](https://openairdocs.org/ntsb/ATL99LA129.md): Air Tractor AT-401 · Caledonia, MS · Accident · No injuries · Limited investigation · Final report · Sep 13, 1999 · N45205 · Substantial damage
  > The failure of the fuel control gear train due to oil contamination. A factor was Inadequate maintenance.
- [NTSB FTW95LA256](https://openairdocs.org/ntsb/FTW95LA256.md): Air Tractor AT-401 · Hearne, TX · Accident · No injuries · Limited investigation · Final report · Jun 21, 1995 · N4537L · Destroyed
  > The loss of engine power as result of the failure of the number two cylinder. Factors were the unsuitable terrain available for the forced landing and the pilot's restricted vision due to oil on the windshield.
- [NTSB FTW95LA241](https://openairdocs.org/ntsb/FTW95LA241.md): Air Tractor AT-401 · Denver City, TX · Accident · No injuries · Limited investigation · Final report · Jun 13, 1995 · N15111 · Destroyed
  > The loss of engine power due to a fracture of the #3 cylinder resulting in the total failure of the cylinder. A factor was the lack of suitable terrain for the forced landing.
- [NTSB FTW94LA256](https://openairdocs.org/ntsb/FTW94LA256.md): Air Tractor AT-401 · Mcgehee, AR · Accident · No injuries · Limited investigation · Final report · Aug 2, 1994 · N45297 · Substantial damage
  > Total loss of engine power as the engine seized due to a blower bearing failure. A factor was the lack of suitable terrain for the forced landing.
- [NTSB DEN93LA081](https://openairdocs.org/ntsb/DEN93LA081.md): Air Tractor AT-401 · Dermott, AR · Accident · No injuries · Limited investigation · Final report · Jul 15, 1993 · N1009T · Substantial damage
  > Power loss due to the total failure of the engine's master rod. Factors were an improper engine overhaul and the lack of suitable terrain for a forced landing.
- [NTSB MIA91LA219](https://openairdocs.org/ntsb/MIA91LA219.md): Air Tractor AT-401 · Sumner, MS · Accident · Minor injuries · Limited investigation · Final report · Sep 16, 1991 · N1004W · Substantial damage
  > Failure of the no. 1 cylinder assembly.
- [NTSB LAX90DXQ03](https://openairdocs.org/ntsb/LAX90DXQ03.md): Air Tractor AT-401 · Tule Lake, CA · Accident · Minor injuries · Final report · Aug 4, 1990 · N45116 · Substantial damage
  > An engine failure due to mechanical failure of the distributor.
- [NTSB LAX90DVA07](https://openairdocs.org/ntsb/LAX90DVA07.md): Air Tractor AT-401 · San Joaquin, CA · Accident · 1 fatal · Final report · Jul 26, 1990 · N7315S · Substantial damage
  > The failure of the no. 4 cylinder head.
- [NTSB MKC90LA081](https://openairdocs.org/ntsb/MKC90LA081.md): Air Tractor AT-401 · Hornersville, MO · Accident · No injuries · Limited investigation · Final report · Apr 5, 1990 · N1015A · Substantial damage
  > Failure of an engine cylinder.

## 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_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 351))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=0390204&occurrence=351

---
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.