# NTSB investigations: Air Tractor AT-301: Loss of engine power(partial) - 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 DEN07LA138](https://openairdocs.org/ntsb/DEN07LA138.md): Air Tractor AT-301 · Alamosa, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 18, 2007 · N69WN · Substantial damage > The failure of the number one cylinder due to fatigue. Contributing to the accident was the pilot's diminished visual lookout due to the oil covered windscreen. - [NTSB NYC03LA168](https://openairdocs.org/ntsb/NYC03LA168.md): Air Tractor AT-301 · Rhinebeck, NY · Accident · Minor injuries · Limited investigation · Final report · Jul 26, 2003 · N23820 · Substantial damage > A loss of engine power due to a failure of the number eight cylinder. - [NTSB ATL97LA127](https://openairdocs.org/ntsb/ATL97LA127.md): Air Tractor AT-301 · Clewiston, FL · Accident · No injuries · Limited investigation · Final report · Aug 29, 1997 · N7307C · Substantial damage > The crack in the #8 cylinder head which led to the loss of power. A factor was the soft terrain. - [NTSB MIA97LA233](https://openairdocs.org/ntsb/MIA97LA233.md): Air Tractor AT-301 · Waynesboro, GA · Accident · Minor injuries · Limited investigation · Final report · Aug 16, 1997 · N4411S · Substantial damage > The obscured vision of the pilot due to oil covering the windscreen. Contributing to the accident was the partial loss of engine power due to a cracked head of one of the cylinders and unsuitable terrain encountered during the forced landing. - [NTSB SEA95LA154](https://openairdocs.org/ntsb/SEA95LA154.md): Air Tractor AT-301 · Roberts, ID · Accident · No injuries · Limited investigation · Final report · Jul 17, 1995 · N4326S · Substantial damage > A loss of engine power due to the separation of the number 3 cylinder exhaust valve rocker arm shaft from the cylinder head, which disabled movement of the exhaust valve. A factor was the lack of suitable terrain for the forced landing. - [NTSB ATL93LA157](https://openairdocs.org/ntsb/ATL93LA157.md): Air Tractor AT301 · Deatsville, AL · Accident · No injuries · Limited investigation · Final report · Sep 11, 1993 · N36613 · Substantial damage > Was a crack in no.3 cylinder head which resulted in the loss of engine power. - [NTSB LAX93LA327](https://openairdocs.org/ntsb/LAX93LA327.md): Air Tractor AT-301 · Dos Palos, CA · Accident · No injuries · Limited investigation · Final report · Aug 18, 1993 · N2330V · Substantial damage > The failure of the master rod which resulted in a complete loss of engine power and subsequent forced landing. The irrigation ditch was a factor in this accident. - [NTSB MIA92LA160](https://openairdocs.org/ntsb/MIA92LA160.md): Air Tractor AT-301 · Redwood, MS · Accident · No injuries · Limited investigation · Final report · Aug 7, 1992 · N3165A · Substantial damage > Improper maintenance of the airplane by an unknown person. - [NTSB MIA91LA158](https://openairdocs.org/ntsb/MIA91LA158.md): Air Tractor AT-301 · High Springs, FL · Accident · No injuries · Limited investigation · Final report · Jun 2, 1991 · N8841S · Substantial damage > Loss of engine power due to disintegration of the impeller caused by a worn impeller bearing. - [NTSB MKC90LA128](https://openairdocs.org/ntsb/MKC90LA128.md): Air Tractor AT-301 · Ulysses, KS · Accident · No injuries · Limited investigation · Final report · Jun 15, 1990 · N3650Z · Substantial damage > Failure of the powerplant cylinder and stall/mush encountered by the pilot in command. - [NTSB SEA89LA071](https://openairdocs.org/ntsb/SEA89LA071.md): Air Tractor AT-301 · Grangeville, ID · Accident · Minor injuries · Limited investigation · Final report · Apr 17, 1989 · N4340S · Substantial damage > A partial power loss due to a blower failure. A factor related to the accident was the soft field condition. - [NTSB MIA89LA127](https://openairdocs.org/ntsb/MIA89LA127.md): Air Tractor AT-301 · Fort Pierce, FL · Accident · No injuries · Limited investigation · Final report · Apr 13, 1989 · N3159D · Substantial damage > Failure of the number five cylinder. Factors related to the accident were: the proximity of homes in the area, which precluded jettisoning of the chemical load, and high vegetation in the emergency landing area. - [NTSB FTW89DPJ03](https://openairdocs.org/ntsb/FTW89DPJ03.md): Air Tractor 301 · Jefferson, OK · Accident · No injuries · Final report · Apr 7, 1989 · N4369S · Substantial damage > Loss of engine power, due to a cracked number 4 cylinder. A factor related to the accident was: the terrace (dirt bank) in the emergency landing area. - [NTSB MIA88LA147](https://openairdocs.org/ntsb/MIA88LA147.md): Air Tractor AT-301 · Hastings, FL · Accident · Minor injuries · Limited investigation · Final report · Apr 14, 1988 · N8841S · Substantial damage > While on an aerial application flt shortly after takeoff, the eng lost power. The plt then dumped the load of fertilizer & landed the acft in a field. After touchdown it nosed over & came to rest. Examination of the eng revealed that the no. four cylinder… - [NTSB FTW87DPJ06](https://openairdocs.org/ntsb/FTW87DPJ06.md): Air Tractor AT301 · El Dorado, OK · Accident · No injuries · Final report · Mar 22, 1987 · N3655G · Substantial damage > The pilot stated that during takeoff from a county road, black smoke started coming out of the engine exhaust. The aircraft then collided with a tree and a post causing substantial damage. It was found that the carburetor heat system had been modified and the… - [NTSB FTW87DPJ04](https://openairdocs.org/ntsb/FTW87DPJ04.md): Air Tractor 301 · Oluskee, OK · Accident · No injuries · Final report · Mar 14, 1987 · N8865S · Substantial damage > During aerial application the engine sustained a power loss due to separation of the number 9 cylinder head. During the forced landing in rough terrain the aircraft was substantially damaged. - [NTSB LAX84LA445](https://openairdocs.org/ntsb/LAX84LA445.md): Air Tractor AT-301 · San Joaquin, CA · Accident · No injuries · Limited investigation · Final report · Aug 19, 1984 · N8636S · Substantial damage > The Air Tractor was on takeoff initial climb and was about 20 ft high when the engine began to backfire. The aircraft settled into the cotton field and rotated about 90 degrees after ground contact. The plt reported that the number one cylinder was found to… - [NTSB FTW82DA101](https://openairdocs.org/ntsb/FTW82DA101.md): Snow AT-301 · Spearman, TX · Accident · No injuries · Final report · Mar 22, 1982 · N2326S · Substantial damage > When the aircraft lost power after spraying crops the pilot executed a forced landing in a field. During the landing the aircraft nosed over. Investigation revealed that an induction hose had failed and blocked the carburetor. A service letter relating to… ## 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 ('0390103', '0390105') 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" = 352)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?model=0390103&occurrence=352 --- 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.