# NTSB investigations: Pratt & Whitney R1340 series: Loss of engine power (total)

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 CEN25LA323](https://openairdocs.org/ntsb/CEN25LA323.md): Grumman American Avn. G-164B · Fowler, IN · Accident · No injuries · Class 3 · Limited · Preliminary report · Aug 15, 2025 · N7015N · Substantial damage
  > On August 15, 2025, about 1910 eastern daylight time, a Grumman American Avn. Corp. G-164-B airplane, N7015N, was substantially damaged when it was involved in an accident near Fowler, Indiana. The pilot was not injured. The airplane was operated under Title…
- [NTSB CEN25LA306](https://openairdocs.org/ntsb/CEN25LA306.md): Air Tractor AT-301 · Davenport, ND · Accident · Serious injuries · Class 3 · Limited · Preliminary report · Aug 7, 2025 · N23069 · Substantial damage
  > On August 6, 2025, at 2035 central daylight time, an Air Tractor Inc AT-301 airplane, N23069, was substantially damaged when it was involved in an accident near Davenport, North Dakota. The commercial pilot sustained serious injuries. The airplane was…
- [NTSB CEN24LA364](https://openairdocs.org/ntsb/CEN24LA364.md): Grumman G-164A · LaPlace, LA · Accident · No injuries · Class 4 · Limited · Final report · Sep 21, 2024 · N6565 · Substantial damage
  > Total loss of engine power during the agricultural application flight for reasons that could not be determined.
- [NTSB CEN22LA187](https://openairdocs.org/ntsb/CEN22LA187.md): North American AT-6D · Fredericksburg, TX · Accident · No injuries · Class 3 · Limited · Final report · Apr 30, 2022 · N29947 · Substantial damage
  > A total loss of engine power due to a failure of the No. 1 cylinder.
- [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 ERA21FA334](https://openairdocs.org/ntsb/ERA21FA334.md): North American SNJ-2 · Wilkes-Barre, PA · Accident · 1 fatal · Class 3 · Field · Final report · Aug 20, 2021 · N52900 · Destroyed
  > A partial loss of engine power for undetermined reasons. Also causal was the pilot’s exceedance of the airplane’s critical angle of attack while maneuvering for a forced landing following the loss of engine power, which resulted in an aerodynamic stall and…
- [NTSB CEN19LA156](https://openairdocs.org/ntsb/CEN19LA156.md): Rockwell S 2R · Oakes, ND · Accident · No injuries · Class 3 · Limited · Final report · May 25, 2019 · N4907X · Substantial damage
  > The failure of the helical cam gear of the engine assembly due to fatigue cracks in the gear teeth, which resulted in a total loss of engine power.
- [NTSB WPR19LA014](https://openairdocs.org/ntsb/WPR19LA014.md): North American SNJ · Agoura Hills, CA · Accident · No injuries · Class 3 · Limited · Final report · Oct 23, 2018 · N7969C · Destroyed
  > The failure of the No. 5 piston rod end due to fatigue, which resulted in a total loss of engine power.
- [NTSB WPR18LA189](https://openairdocs.org/ntsb/WPR18LA189.md): Grumman G164B · Colusa, CA · Accident · No injuries · Class 3 · Limited · Final report · Jul 9, 2018 · N6696K · Substantial damage
  > Total loss of engine power for reasons that could not be determined based on the available information.
- [NTSB WPR18LA128](https://openairdocs.org/ntsb/WPR18LA128.md): Grumman Acft ENG Cor-Schweizer G 164C · Maxwell, CA · Accident · No injuries · Class 3 · Limited · Final report · Apr 29, 2018 · N6674K · Substantial damage
  > A total loss of engine power due to an uncommanded closing of the fuel shutoff valve, which terminated fuel to the engine. The reason for the fuel shutoff valve’s closure could not be determined based on the available information.
- [NTSB ERA16LA242](https://openairdocs.org/ntsb/ERA16LA242.md): Grumman Acft ENG Cor-Schweizer G-164 · Laurel, DE · Accident · No injuries · Limited investigation · Final report · Jul 2, 2016 · N6781K · Substantial damage
  > A total loss of engine power due to an encounter with a bird, which collided with the spray pump fan assembly and subsequently sent blade fragments into the engine compartment, damaging the throttle linkage.
- [NTSB ERA16LA130](https://openairdocs.org/ntsb/ERA16LA130.md): Grumman Acft ENG Cor-Schweizer G-164 · Myakka, FL · Accident · No injuries · Limited investigation · Final report · Mar 14, 2016 · N6654K · Substantial damage
  > A total loss of engine power for reasons that could not be determined because postaccident examination of the engine revealed no mechanical anomalies that would have precluded normal operation.
- [NTSB WPR15LA194](https://openairdocs.org/ntsb/WPR15LA194.md): Grumman Acft ENG Cor-Schweizer G 164A · Five Points, CA · Accident · Minor injuries · Limited investigation · Final report · Jun 21, 2015 · N8598H · Substantial damage
  > Maintenance personnel’s improper reassembly of the engine during overhaul, which led to the failure of the supercharger-blower due to a lack of lubrication and the subsequent total loss of engine power during takeoff.
- [NTSB WPR15LA106](https://openairdocs.org/ntsb/WPR15LA106.md): Grumman Acft ENG Cor-Schweizer G 164A · Alfalfa, OR · Accident · No injuries · Limited investigation · Final report · Feb 18, 2015 · N4863 · Substantial damage
  > A total loss of engine power after takeoff for reasons that could not be determined, because examination of the engine did not reveal any mechanical anomalies that would have precluded normal operation.
- [NTSB WPR15LA023](https://openairdocs.org/ntsb/WPR15LA023.md): Air Tractor AT 301 · Basin City, WA · Accident · No injuries · Limited investigation · Final report · Oct 27, 2014 · N8878S · Substantial damage
  > Maintenance personnel’s and the airplane owner’s failure to inspect the engine for cracks in the cylinders as required by an airworthiness directive, which resulted in the loss of engine power during low-altitude maneuvering flight.
- [NTSB ERA15LA030](https://openairdocs.org/ntsb/ERA15LA030.md): North American T 6G · Naples, FL · Accident · No injuries · Limited investigation · Final report · Oct 23, 2014 · N22NA · Substantial damage
  > The total loss of engine power during the initial climb due to fuel starvation for reasons that could not be determined because postaccident examinations of the airframe and engine fuel system components revealed no evidence of a mechanical malfunction or…
- [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 CEN14CA442](https://openairdocs.org/ntsb/CEN14CA442.md): Rockwell International S 2R · Kerkhoven, MN · Accident · No injuries · Data collection · Final report · Aug 19, 2014 · N9646A · Substantial damage
  > The pilot failure to see and avoid the guide wire during the aerial application flight.
- [NTSB WPR14LA201](https://openairdocs.org/ntsb/WPR14LA201.md): Schweizer G 164B · Biggs, CA · Accident · No injuries · Limited investigation · Final report · May 13, 2014 · N3633C · Substantial damage
  > The assembler’s improper fabrication of a fuel line (hose) and the subsequent failure to verify that it was not occluded, which resulted in fuel starvation and a total loss of engine power during takeoff.
- [NTSB CEN13LA519](https://openairdocs.org/ntsb/CEN13LA519.md): Gulfstream-Schweizer Gulfstream AM G 164B · Eagle Lake, TX · Accident · No injuries · Limited investigation · Final report · Aug 13, 2013 · N8222K · Substantial damage
  > The failure of one of the engine cylinders, which resulted in the total loss of engine power and subsequent forced landing.
- [NTSB WPR13LA248](https://openairdocs.org/ntsb/WPR13LA248.md): Air Tractor AT-301 · Wheatland, WY · Accident · No injuries · Limited investigation · Final report · May 24, 2013 · N23647 · Substantial damage
  > A loss of engine power due to fuel exhaustion and the pilot's inadequate fuel planning.
- [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 ERA13LA029](https://openairdocs.org/ntsb/ERA13LA029.md): Grumman Acft ENG Cor-Schweizer G-164B · Edison, GA · Accident · Minor injuries · Limited investigation · Final report · Oct 19, 2012 · N6670K · Substantial damage
  > The total loss of engine power due to the fatigue failure of the k-pin associated with the No. 1 cylinder.
- [NTSB CEN12LA491](https://openairdocs.org/ntsb/CEN12LA491.md): Grumman G-164A · Fergus Falls, MN · Accident · No injuries · Limited investigation · Final report · Jul 20, 2012 · N4638 · Substantial damage
  > A total loss of engine power due to a cracked No. 2 cylinder head.
- [NTSB CEN11LA556](https://openairdocs.org/ntsb/CEN11LA556.md): Grumman G-164A · El Campo, TX · Accident · No injuries · Limited investigation · Final report · Aug 18, 2011 · N6567 · Substantial damage
  > Separation of the No. 3 cylinder exhaust valve rocker arm, which resulted in a loss of engine power.
- [NTSB CEN11FA562](https://openairdocs.org/ntsb/CEN11FA562.md): Air Tractor AT-301 · Nekoosa, WI · Accident · No injuries · Field investigation · Final report · Aug 4, 2011 · N4345S · Substantial damage
  > A total loss of engine power during initial climb for undetermined reasons.
- [NTSB CEN11LA543](https://openairdocs.org/ntsb/CEN11LA543.md): Aero Commander S2R · Washington, IA · Accident · No injuries · Limited investigation · Final report · Aug 3, 2011 · N1735S · Substantial damage
  > The loss of engine power for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.
- [NTSB WPR11LA320](https://openairdocs.org/ntsb/WPR11LA320.md): Schweizer G-164B · Yuba City, CA · Accident · No injuries · Limited investigation · Final report · Jul 9, 2011 · N7503L · Substantial damage
  > High-cycle fatigue on the 1st-stage compressor blade retaining ring, which resulted in the ring’s fracture and a subsequent loss of engine power.
- [NTSB WPR11LA279](https://openairdocs.org/ntsb/WPR11LA279.md): Rockwell International S-2R · Brawley, CA · Accident · Serious injuries · Limited investigation · Final report · Jun 23, 2011 · N8520V · Substantial damage
  > The partial loss of engine power shortly after takeoff, which likely resulted from the failure of the piston connecting rod in cylinder number 3 due to hydraulic lock in that cylinder.
- [NTSB CEN11LA484](https://openairdocs.org/ntsb/CEN11LA484.md): Schweizer G-164B · Cash, AR · Accident · No injuries · Limited investigation · Final report · Jun 11, 2011 · N3629C · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB WPR11LA238](https://openairdocs.org/ntsb/WPR11LA238.md): Grumman G-164A · Hazelton, ID · Accident · No injuries · Limited investigation · Final report · May 28, 2011 · N9724 · Substantial damage
  > A total loss of engine power during low-level maneuvering due to an excessively worn carburetor.
- [NTSB CEN11LA335](https://openairdocs.org/ntsb/CEN11LA335.md): Grumman Acft ENG Cor-Schweizer G-164A · Bono, AR · Accident · No injuries · Limited investigation · Final report · May 9, 2011 · N8930H · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB WPR10LA396](https://openairdocs.org/ntsb/WPR10LA396.md): Grumman G164 · Tracy, CA · Accident · No injuries · Limited investigation · Final report · Aug 11, 2010 · N6781K · Substantial damage
  > A total loss of engine power while maneuvering due to an internal catastrophic failure to the master rod and piston connecting rod links.
- [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 WPR10LA214](https://openairdocs.org/ntsb/WPR10LA214.md): Grumman Acft ENG Cor-Schweizer G-164A · Madera, CA · Accident · No injuries · Limited investigation · Final report · Apr 23, 2010 · N4450 · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB CEN09LA503](https://openairdocs.org/ntsb/CEN09LA503.md): Air Tractor AT401 · Waterloo, IA · Accident · No injuries · Limited investigation · Final report · Aug 4, 2009 · N60747 · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB CEN09LA239](https://openairdocs.org/ntsb/CEN09LA239.md): Air Tractor AT-301 · Corning, AR · Accident · No injuries · Limited investigation · Final report · Apr 7, 2009 · N36597 · Substantial damage
  > A loss of engine power due to the failure of the number one engine cylinder for undetermined reasons.
- [NTSB DFW08LA223](https://openairdocs.org/ntsb/DFW08LA223.md): Rockwell International S-2R · Uvalde, TX · Accident · No injuries · Limited investigation · Final report · Sep 1, 2008 · N8472V · Substantial damage
  > A total loss of engine power due to the improper use of unauthorized replacement parts in the engine and repeated operation of the engine in an over-temperature condition.
- [NTSB CHI08CA266](https://openairdocs.org/ntsb/CHI08CA266.md): Air Tractor AT-301A · Jasper, MN · Accident · No injuries · Data collection · Final report · Aug 25, 2008 · N3654T · Substantial damage
  > The pilot's failure to assure the primer control was locked during the aircraft preflight. Factors associated with the accident were the low altitude at which the airplane was operating, the fence, the roadway, and the ditch.
- [NTSB DFW08CA216](https://openairdocs.org/ntsb/DFW08CA216.md): Air Tractor AT-301 · Wisner, LA · Accident · No injuries · Data collection · Final report · Aug 22, 2008 · N2391Z · Substantial damage
  > The loss of engine power for undetermined reasons.
- [NTSB CHI08CA251](https://openairdocs.org/ntsb/CHI08CA251.md): Air Tractor AT-301B · Monticello, IA · Accident · Minor injuries · Data collection · Final report · Aug 13, 2008 · N3161D · Substantial damage
  > Poor preflight planning in that the pilot failed to assure an adequate fuel supply was on board for the flight which resulted in fuel exhaustion. Factors associated with the accident were the low altitude of the airplane when the loss of power occurred and…
- [NTSB CHI08CA242](https://openairdocs.org/ntsb/CHI08CA242.md): Schweizer G-164A · Jefferson, IA · Accident · No injuries · Data collection · Final report · Aug 8, 2008 · N73PB · Substantial damage
  > The loss of engine power for an undetermined reason and the unsuitable terrain encountered during the forced landing. The corn crop was a factor.
- [NTSB DFW08CA192](https://openairdocs.org/ntsb/DFW08CA192.md): Grumman G-164A · Bovina, TX · Accident · No injuries · Data collection · Final report · Jul 18, 2008 · N7832 · Substantial damage
  > Loss of engine power for undetermined reasons.
- [NTSB DEN08LA085](https://openairdocs.org/ntsb/DEN08LA085.md): North American SNJ-5 · Wolcott, CO · Accident · Minor injuries · Limited investigation · Final report · May 5, 2008 · N12KY · Substantial damage
  > The failure of the engine driven fuel pump flange due to oil starvation, resulting in the loss of engine power due to fuel starvation. Contributing to the accident was the lack of suitable terrain for a forced landing.
- [NTSB DFW08CA086](https://openairdocs.org/ntsb/DFW08CA086.md): Air Tractor At-301 · Plains, KS · Accident · No injuries · Data collection · Final report · Mar 26, 2008 · N4427S · Substantial damage
  > A loss of engine power as a result of a blocked carburetor. A factor was the lack of suitable terrain for the forced landing.

## 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.engine_model_code IN ('52016')
    AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e WHERE e.case_mkey = x.case_mkey AND e.aircrafts_position = x.position AND e."isDefiningEvent" AND e."tier2Number" = '341'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/341/cases?engine=52016

---
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.