# NTSB investigations: Pratt & Whitney R1340 series, MT

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 WPR22LA293](https://openairdocs.org/ntsb/WPR22LA293.md): Air Tractor AT-301 · Circle, MT · Accident · No injuries · Class 4 · Limited · Final report · Aug 7, 2022 · N36542 · Substantial damage
  > The loss of engine power due to carburetor ice. Contributing to the accident was the pilot’s failure to use carburetor heat.
- [NTSB WPR14LA198](https://openairdocs.org/ntsb/WPR14LA198.md): Rockwell International S 2R · Medicine Lake, MT · Accident · No injuries · Limited investigation · Final report · May 21, 2014 · N702CB · Substantial damage
  > The pilot’s failure to maintain airplane control and sufficient altitude to clear terrain during a low-altitude maneuver.
- [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 WPR11CA286](https://openairdocs.org/ntsb/WPR11CA286.md): Air Tractor AT301 · Circle, MT · Accident · No injuries · Data collection · Final report · Jun 24, 2011 · N2362D · Substantial damage
  > The pilot's failure to attain and maintain an adequate airspeed during initial climb.
- [NTSB WPR11LA272](https://openairdocs.org/ntsb/WPR11LA272.md): Air Tractor AT-301 · Hogeland, MT · Accident · 1 fatal · Limited investigation · Final report · Jun 21, 2011 · N3661B · Substantial damage
  > Collision with the ground while maneuvering at low altitude for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation.
- [NTSB SEA02LA111](https://openairdocs.org/ntsb/SEA02LA111.md): Rockwell S-2R Thrush · Winifred, MT · Accident · Minor injuries · Limited investigation · Final report · Jun 26, 2002 · N600DN · Substantial damage
  > The pilot's improper inflight decision to continue his aerial application flight after he realized the aircraft might be low on fuel. Factors include the pilot's failure to maintain clearance from a shed.
- [NTSB SEA00LA148](https://openairdocs.org/ntsb/SEA00LA148.md): Air Tractor AT-301 · Brockway, MT · Accident · Serious injuries · Limited investigation · Final report · Jul 31, 2000 · N4330S · Substantial damage
  > The pilot's failure to maintain clearance from power lines.
- [NTSB SEA95LA161](https://openairdocs.org/ntsb/SEA95LA161.md): Air Tractor AT-301 · Havre, MT · Accident · No injuries · Limited investigation · Final report · Jul 24, 1995 · N3660U · Substantial damage
  > the loss of power due to a failure of the cylinder head exhaust valve rocker box. The tall crop encountered during the forced landing is a factor.
- [NTSB DEN87LA084](https://openairdocs.org/ntsb/DEN87LA084.md): Air Tractor AT-301 · Conrad, MT · Accident · No injuries · Limited investigation · Final report · Apr 5, 1987 · N23069 · Substantial damage
  > An ag plt was returning from an aerial application. Six miles from the destination arpt the engine quit. The plt attempted to land on a road but the acft struck the edge of a pit, spun across the road and came to rest facing 180 degrees from the original…
- [NTSB DEN84LA224](https://openairdocs.org/ntsb/DEN84LA224.md): Grumman G-164A · Richey, MT · Accident · No injuries · Limited investigation · Final report · Jul 15, 1984 · N6589 · Destroyed
  > The plt had finished spraying & was proceeding to the glendive arpt. He said that eng or prop began a sudden severe vibration which required the eng to be shut down. An emegency landing was made. The plt stated that the left wing impacted a hill which spun…
- [NTSB DEN83LA136](https://openairdocs.org/ntsb/DEN83LA136.md): Air Tractor AT-301 · Conrad, MT · Accident · No injuries · Limited investigation · Final report · Jun 9, 1983 · N23069 · Substantial damage
  > The acft landed hard and collapsed the right main landing gear during a forced landing after fuel exhaustion. During a landing to reload the pilot had handled the herbicide on-loading and a ground crewman was loading the acft fuel. The supply of 80/87 octane…
- [NTSB DEN82DTI09](https://openairdocs.org/ntsb/DEN82DTI09.md): Air Tractor AT-301 · Greenough, MT · Accident · No injuries · Final report · Jan 3, 1982 · N23069 · Substantial damage
  > During takeoff the aircraft struck a snow berm. The aircraft received substantial damage to both wings and prop. The aircraft had been landed on a county road about a week earlier due to deteriorating weather.
- [NTSB DEN82FTA04](https://openairdocs.org/ntsb/DEN82FTA04.md): Ayres S2R · Richey, MT · Accident · Minor injuries · Closed · Nov 23, 1981 · N5686X · Substantial damage
- [NTSB SEA80FTA10](https://openairdocs.org/ntsb/SEA80FTA10.md): Grumman G-164B · Billings, MT · Accident · No injuries · Closed · Apr 19, 1980 · N6687K · Destroyed
- [NTSB SEA76DTA24](https://openairdocs.org/ntsb/SEA76DTA24.md): Aero Comdr 600S2R · Scobey, MT · Accident · No injuries · Closed · Jun 10, 1976 · N4901X · Substantial damage
- [NTSB SEA68F0312](https://openairdocs.org/ntsb/SEA68F0312.md): Snow S2A · Billings, MT · Accident · No injuries · Closed · May 5, 1968 · N1626S · Substantial damage
- [NTSB FTW67F0522](https://openairdocs.org/ntsb/FTW67F0522.md): Boeing A75N1 · Billings, MT · Accident · No injuries · Closed · Mar 21, 1967 · N59137 · Substantial damage
- [NTSB SEA66D0280](https://openairdocs.org/ntsb/SEA66D0280.md): N American T-6G · Hogeland, MT · Accident · No injuries · Closed · May 21, 1966 · N3172G · Substantial damage

## 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."eventStateOrRegion" = 'MT' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('52016'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=52016&state=MT

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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.