# NTSB investigations: Air Tractor AT-401

A list on [Air Tractor AT-401](https://openairdocs.org/model/air-tractor-at-401.md).

Matched to the registry by N-number and event date, newest first.

Page 1 of 2 · 88 investigations

- [NTSB CEN25LA191](https://openairdocs.org/ntsb/CEN25LA191.md): Air Tractor AT-401 · Hamlet, NE · Accident · No injuries · Class 4 · Limited · Final report · Jun 2, 2025 · N60057 · Substantial damage
  > The pilot's failure to maintain clearance from the power lines during low altitude maneuvering.
- [NTSB CEN23LA347](https://openairdocs.org/ntsb/CEN23LA347.md): Air Tractor AT-401 · Jamestown, ND · Accident · No injuries · Class 4 · Limited · Final report · Aug 3, 2023 · N6015W · Substantial damage
  > The pilot’s failure to maintain proper airspeed after liftoff, which resulted in the airplane exceeding its critical angle of attack and an aerodynamic stall.
- [NTSB CEN22LA157](https://openairdocs.org/ntsb/CEN22LA157.md): Air Tractor AT-401 · Rayville, LA · Accident · Serious injuries · Class 3 · Limited · Final report · Mar 26, 2022 · N9192E · Substantial damage
  > A loss of engine power for a reason that could not be determined based on available information.
- [NTSB CEN21LA319](https://openairdocs.org/ntsb/CEN21LA319.md): Air Tractor AT-401 · Carroll, IA · Accident · No injuries · Class 3 · Limited · Final report · Jul 13, 2021 · N7315P · Substantial damage
  > The wear-related failure of the airframe fuel boost pump, which resulted in fuel starvation and a loss of engine power.
- [NTSB CEN20CA311](https://openairdocs.org/ntsb/CEN20CA311.md): Air Tractor AT 401 · Burlington, CO · Accident · Minor injuries · Class 4 · Data collection · Final report · Jul 27, 2020 · N9190Q · Substantial damage
  > The pilot’s failure to maintain clearance from guy-wires during low-altitude agricultural operations.
- [NTSB CEN15LA345](https://openairdocs.org/ntsb/CEN15LA345.md): Air Tractor AT 401 · Nekoosa, WI · Accident · No injuries · Limited investigation · Final report · Aug 5, 2015 · N1539U · Substantial damage
  > The pilot’s inadequate preflight planning, which resulted in his attempt to take off for the agricultural application flight with the airplane over its maximum gross weight in high-density altitude conditions and led to the airplane’s degraded climb…
- [NTSB GAA15CA117](https://openairdocs.org/ntsb/GAA15CA117.md): Air Tractor AT 401 · Wall, SD · Accident · No injuries · Data collection · Final report · Jun 9, 2015 · N4549E · Substantial damage
  > The pilot's failure to adjust the airplane's useful load to compensate for the high temperature, which resulted in an insufficient climb rate to clear surrounding terrain, and a runway excursion.
- [NTSB CEN14LA450](https://openairdocs.org/ntsb/CEN14LA450.md): Air Tractor AT-401 · Natchez, LA · Accident · No injuries · Limited investigation · Final report · Aug 24, 2014 · N91968 · Destroyed
  > The loss of power due to the failure of the No. 2 exhaust valve and rocker boss during takeoff.
- [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 WPR14CA002](https://openairdocs.org/ntsb/WPR14CA002.md): Air Tractor AT 401 · Waco, TX · Accident · No injuries · Data collection · Final report · Oct 1, 2013 · N1013R · Substantial damage
  > The pilot’s failure to maintain directional control during the takeoff in gusting wind conditions.
- [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 CEN12LA344](https://openairdocs.org/ntsb/CEN12LA344.md): Air Tractor AT401 · Kenmare, ND · Accident · No injuries · Limited investigation · Final report · Jun 4, 2012 · N4547Q · Substantial damage
  > The pilot's failure to maintain directional control during an aborted takeoff.
- [NTSB WPR11LA386](https://openairdocs.org/ntsb/WPR11LA386.md): Air Tractor AT-401 · Hardin, MT · Accident · No injuries · Limited investigation · Final report · Aug 16, 2011 · N1012T · Substantial damage
  > The loss of engine power during takeoff due to the fatigue failure of the turbine wheel blades, which resulted from inadequate maintenance and inspections.
- [NTSB CEN10LA503](https://openairdocs.org/ntsb/CEN10LA503.md): Air Tractor AT-401 · Castroville, TX · Accident · No injuries · Limited investigation · Final report · Aug 26, 2010 · N4530L · Substantial damage
  > A loss of engine power due to the failure of the torque sensor bearing.
- [NTSB CEN10LA420](https://openairdocs.org/ntsb/CEN10LA420.md): Air Tractor AT-401 · Toulin, IL · Accident · No injuries · Limited investigation · Final report · Jul 21, 2010 · N45297 · Substantial damage
  > A partial loss of engine power as a result of a cracked cylinder and the reduced visibility due to the oil-covered windshield.
- [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.
- [NTSB CHI08CA220](https://openairdocs.org/ntsb/CHI08CA220.md): Air Tractor AT-401 · Lake View, IA · Accident · Minor injuries · Data collection · Final report · Jul 26, 2008 · N9193F · Substantial damage
  > The pilot not obtaining/maintaining altitude/clearance from the power line while performing an aerial application maneuver.
- [NTSB DFW08CA146](https://openairdocs.org/ntsb/DFW08CA146.md): Air Tractor 401-0860 · Mumford, TX · Accident · No injuries · Data collection · Final report · May 16, 2008 · N15420 · Substantial damage
  > A total loss of engine power for undetermined reasons.
- [NTSB LAX08CA034](https://openairdocs.org/ntsb/LAX08CA034.md): Air Tractor AT-401 · Soledad, CA · Accident · Serious injuries · Data collection · Final report · Dec 6, 2007 · N6024M · Destroyed
  > The pilot's failure to maintain an adequate clearance from mountainous terrain while maneuvering during an aerial application mission. Contributing to the accident was the pilot's diverted attention inside the cockpit.
- [NTSB DFW07LA138](https://openairdocs.org/ntsb/DFW07LA138.md): Air Tractor AT-401 · Oak Grove, LA · Accident · No injuries · Limited investigation · Final report · Jun 6, 2007 · N92PK · Substantial damage
  > A complete loss of power due to failure of the impeller drive gear train and displacement of the blower spring drive mechanism, which resulted in seizure of the propeller shaft/crankshaft. Also causal was the failure of the phenolic separator bracket of the…
- [NTSB DFW06CA152](https://openairdocs.org/ntsb/DFW06CA152.md): Air Tractor AT-401 · Victoria, TX · Accident · No injuries · Data collection · Final report · Jun 3, 2006 · N9190B · Substantial damage
  > The pilot's delay in aborting the takeoff which resulted in an overrun. A contributing factor was the unfavorable wind.
- [NTSB DFW06CA149](https://openairdocs.org/ntsb/DFW06CA149.md): Air Tractor AT-401 · Garden City, TX · Accident · No injuries · Data collection · Final report · Jun 1, 2006 · N7318C · Substantial damage
  > The pilot's improper in-flight planning resulting in the loss of engine power due to fuel exhaustion. A contributing factor was the lack of suitable terrain for the forced landing.
- [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 LAX05LA085](https://openairdocs.org/ntsb/LAX05LA085.md): Air Tractor AT-401 · Calexico, CA · Accident · No injuries · Limited investigation · Final report · Feb 4, 2005 · N4530L · Substantial damage
  > a loss of directional control due to a jammed rudder pedal, which prevented the pilot from exercising full rudder control authority.
- [NTSB FTW04LA179](https://openairdocs.org/ntsb/FTW04LA179.md): Air Tractor AT-401 · Winnsboro, LA · Accident · No injuries · Limited investigation · Final report · Jul 10, 2004 · N10061 · Substantial damage
  > The pilot's mismanagement of fuel resulting in fuel starvation. A contributing factor was the ditch.
- [NTSB FTW04LA130](https://openairdocs.org/ntsb/FTW04LA130.md): Air Tractor AT-401 · San Angelo, TX · Accident · No injuries · Limited investigation · Final report · May 19, 2004 · N4508Y · Destroyed
  > The loss of engine power for undetermined reasons. A contributing factor was the soft terrain encountered during the aborted takeoff.
- [NTSB MIA03LA094](https://openairdocs.org/ntsb/MIA03LA094.md): Air Tractor AT- 401 · Fellsmere, FL · Accident · Serious injuries · Limited investigation · Final report · Apr 8, 2003 · N4549N · Destroyed
  > The poor in-flight planning by the pilot-in-command for his overhsooting the pull-up following a spray pass resulting in the in-flight collision with trees then terrain. Contributing to the accident was sunglare that the pilot encountered during the spray…
- [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 FTW03LA084](https://openairdocs.org/ntsb/FTW03LA084.md): Air Tractor AT-401 · Alamo, TX · Accident · Serious injuries · Limited investigation · Final report · Jan 14, 2003 · N1537R · Substantial damage
  > The pilot's failure to maintain airspeed which resulted in a stall. Low altitude flight is a contributing factor.
- [NTSB FTW02LA245](https://openairdocs.org/ntsb/FTW02LA245.md): Air Tractor AT-401 · Hearne, TX · Accident · Minor injuries · Limited investigation · Final report · Aug 30, 2002 · N9193Y · Substantial damage
  > The pilot's failure to maintain clearance with a pump rig while maneuvering during an aerial application flight. A factor was the object.
- [NTSB LAX02LA034](https://openairdocs.org/ntsb/LAX02LA034.md): Air Tractor AT-401B · Las Vegas, NV · Accident · No injuries · Limited investigation · Final report · Nov 30, 2001 · N9186J · 2 aircraft · No damage
  > the failure of the AT-401 pilot to maintain clearance with the AT-402 airplane during landing. Contributing factors were the unreliable communication radio in the AT-401, the AT-401 pilot's continued flight with known communication radio problems, and the…
- [NTSB ATL01LA099](https://openairdocs.org/ntsb/ATL01LA099.md): Air Tractor AT-401 · Batesville, MS · Accident · Minor injuries · Limited investigation · Final report · Aug 28, 2001 · N91922 · Destroyed
  > The loss of engine power for undetermined reasons. A factor was the lack of suitable terrain for an emergency landing.
- [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 CHI01IA246](https://openairdocs.org/ntsb/CHI01IA246.md): Air Tractor AT-401 · Kenesaw, NE · Incident · No injuries · Incident investigation · Final report · Jul 27, 2001 · N4553K · Minor damage
  > The propeller blade fatigue leading to its tip separating during an aerial application. Factors were no suitable terrain for an emergency landing, high vegetation, and soft terrain encountered during the emergency landing.
- [NTSB CHI01LA195](https://openairdocs.org/ntsb/CHI01LA195.md): Air Tractor AT-401 · Ellinwood, KS · Accident · No injuries · Limited investigation · Final report · Jul 2, 2001 · N4549E · Substantial damage
  > The pilot failed to see and avoid the guy wire during an aerial application flight. A factor associated with the accident was the guy wire.
- [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 FTW00LA212](https://openairdocs.org/ntsb/FTW00LA212.md): Air Tractor AT-401 · Panhandle, TX · Accident · 1 fatal · Limited investigation · Final report · Jul 18, 2000 · N6055W · Destroyed
  > The pilot's failure to maintain airspeed, which resulted in a stall.
- [NTSB LAX00LA271](https://openairdocs.org/ntsb/LAX00LA271.md): Air Tractor AT-401 · Ripley, CA · Accident · No injuries · Limited investigation · Final report · Jul 13, 2000 · N4508Y · Substantial damage
  > A loss of engine power due to the separation of a connecting rod from the crankshaft.
- [NTSB SEA00LA073](https://openairdocs.org/ntsb/SEA00LA073.md): Air Tractor AT-401 · Acequia, ID · Accident · Minor injuries · Limited investigation · Final report · Apr 14, 2000 · N1524H · Substantial damage
  > The pilot's failure to obtain/maintain adequate clearance with the irrigation system during initial climb. A contributing factor was the irrigation pivot.
- [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 FTW99LA239](https://openairdocs.org/ntsb/FTW99LA239.md): Air Tractor AT-401 · Hart, TX · Accident · Minor injuries · Limited investigation · Final report · Aug 25, 1999 · N15119 · Substantial damage
  > The pilot's failure to maintain clearance with power lines.
- [NTSB FTW99LA220](https://openairdocs.org/ntsb/FTW99LA220.md): Air Tractor AT-401 · Humphrey, AR · Accident · No injuries · Limited investigation · Final report · Aug 12, 1999 · N1031Q · Substantial damage
  > Fuel exhaustion as a result of the pilot's failure to refuel the airplane.
- [NTSB MIA99LA212](https://openairdocs.org/ntsb/MIA99LA212.md): Air Tractor AT-401 · Moore Haven, FL · Accident · No injuries · Limited investigation · Final report · Aug 2, 1999 · N15585 · Substantial damage
  > The pilot exceeding the gross takeoff weight which reduced the climb capability and subsequent in-flight collision with terrain. Contributing to the accident was the high temperature and the pilot's failure to use aircraft performance data for the weather…
- [NTSB SEA99LA075](https://openairdocs.org/ntsb/SEA99LA075.md): Air Tractor AT-401 · Jerome, ID · Accident · No injuries · Limited investigation · Final report · May 27, 1999 · N6024M · Substantial damage
  > Fuel exhaustion. Carburetor contamination and rough terrain were factors.
- [NTSB FTW99FA004](https://openairdocs.org/ntsb/FTW99FA004.md): Air Tractor AT-401 · Newellton, LA · Accident · 1 fatal · Field investigation · Final report · Oct 8, 1998 · N4531M · Substantial damage
  > The pilot's failure to maintain aircraft control during an inadvertent entry into adverse weather conditions. A related factor was the fog.
- [NTSB CHI98LA355](https://openairdocs.org/ntsb/CHI98LA355.md): Air Tractor AT-401 · N. Ottawa Twp., MN · Accident · No injuries · Limited investigation · Final report · Aug 28, 1998 · N4543F · Destroyed
  > A loss of engine power due to a worn piston ring. A related factor was the owner exceeded the manufacturer's recommended engine overhaul.
- [NTSB ATL98LA117](https://openairdocs.org/ntsb/ATL98LA117.md): Air Tractor 401 · Holly Bluff, MS · Accident · No injuries · Limited investigation · Final report · Aug 22, 1998 · N10103 · Substantial damage
  > The malfunction of the carburetor which resulted in improper fuel flow to the engine.
- [NTSB MIA98LA228](https://openairdocs.org/ntsb/MIA98LA228.md): Air Tractor AT401 · Ruleville, MS · Accident · No injuries · Limited investigation · Final report · Aug 21, 1998 · N1013Z · Destroyed
  > A fire of undetermined origin.
- [NTSB MIA98LA181](https://openairdocs.org/ntsb/MIA98LA181.md): Air Tractor AT-401 · Rich, MS · Accident · No injuries · Limited investigation · Final report · May 24, 1998 · N1008Y · Substantial damage
  > a loss of engine power for an undetermined reason, resulting in a forced landing and subsequent impact with rough terrain.

Next page: https://openairdocs.org/model/air-tractor-at-401/ntsb.md?page=2

## 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_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = a.case_mkey
WHERE a.aircraft_model_code IN ('0390204', '0390209')
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/model/air-tractor-at-401/ntsb

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