# NTSB investigations: Pratt & Whitney PT6A series: Loss of engine power (partial) 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 CEN25LA313](https://openairdocs.org/ntsb/CEN25LA313.md): Air Tractor AT-502 · Lawrenceville, IL · Accident · Minor injuries · Class 3 · Limited · Preliminary report · Aug 10, 2025 · N9193V · Substantial damage > On August 10, 2025, about 1321 central daylight time, an Air Tractor AT-502, was substantially damaged when it was involved in an accident near Lawrenceville, Illinois. The pilot sustained minor injuries. The airplane was operated as a Title 14 Code of… - [NTSB ERA25LA222](https://openairdocs.org/ntsb/ERA25LA222.md): Dehavilland DHC-6 Twin Otter · Tullahoma, TN · Accident · Serious injuries · Class 3 · Limited · Preliminary report · Jun 8, 2025 · N166DH · Substantial damage > On June 8, 2025, about 1220 central daylight time, a DeHavilland DHC-6 Twin Otter, N166DH, was involved in an accident near Tullahoma, Tennessee. The commercial pilot and five passengers were seriously injured, and 15 passengers were not injured. The flight… - [NTSB CEN23LA317](https://openairdocs.org/ntsb/CEN23LA317.md): Grumman G-164A · Patoka, IL · Accident · No injuries · Class 3 · Limited · Final report · Jul 22, 2023 · N9892 · Substantial damage > A partial loss of engine power due to the failure of two compressor turbine blades as a result of the engine operating near or above the engine’s operating limits for an undetermined amount of time beyond the recommended engine’s TBO limit, which led to… - [NTSB ERA21LA287](https://openairdocs.org/ntsb/ERA21LA287.md): Piper PA46-500TP · Manteo, NC · Accident · No injuries · Class 3 · Limited · Final report · Jul 6, 2021 · N31062 · Substantial damage > The improperly secured pneumatic compressor discharge air (P3) line coupling nut on the engine, which ultimately allowed the nut to back off resulting in a partial loss of engine power. - [NTSB CEN18LA249](https://openairdocs.org/ntsb/CEN18LA249.md): Air Tractor AT502 · Tappen, ND · Accident · No injuries · Limited investigation · Final report · Jun 28, 2018 · N502S · Substantial damage > The partial loss of engine power for reasons that could not be determined based on the available evidence. - [NTSB ERA18LA031](https://openairdocs.org/ntsb/ERA18LA031.md): Piper PA46 · Clearwater, FL · Accident · Minor injuries · Limited investigation · Final report · Nov 25, 2017 · N863RB · Substantial damage > A partial loss of engine power for reasons that could not be determined based on the available information. - [NTSB CEN15LA389](https://openairdocs.org/ntsb/CEN15LA389.md): Air Tractor AT 502B · Monroe, NE · Accident · Minor injuries · Limited investigation · Final report · Aug 27, 2015 · N61267 · Substantial damage > Loss of propeller thrust for reasons that could not be determined, since examination of the airplane's engine, propeller, and associated accessories revealed no anomalies. - [NTSB ERA15LA293](https://openairdocs.org/ntsb/ERA15LA293.md): Beech C90B · Georgetown, KY · Accident · Serious injuries · Limited investigation · Final report · Aug 2, 2015 · N257CQ · Substantial damage > Undetermined based on the available evidence. - [NTSB CEN15LA180](https://openairdocs.org/ntsb/CEN15LA180.md): Cessna 208B · Verdigris, OK · Accident · Minor injuries · Limited investigation · Final report · Mar 24, 2015 · N106BZ · Substantial damage > The fuel pump gear manufacturer’s allowance of set-up gears made from a nonconforming material to be put in the production inventory system, the installation of a nonconforming gear in the accident airplane’s production fuel pump, and the gear’s failure,… - [NTSB CEN15FA034](https://openairdocs.org/ntsb/CEN15FA034.md): Raytheon B200 · Wichita, KS · Accident · 4 fatal · Field investigation · Final report · Oct 30, 2014 · N52SZ · Destroyed > The pilot's failure to maintain lateral control of the airplane after a reduction in left engine power and his application of inappropriate rudder input. Contributing to the accident was the pilot's failure to follow the emergency procedures for an engine… - [NTSB WPR14LA245](https://openairdocs.org/ntsb/WPR14LA245.md): Air Tractor AT 502B · Princeton, CA · Accident · No injuries · Limited investigation · Final report · Jun 13, 2014 · N502JS · Substantial damage > The partial loss of engine power during takeoff for reasons that could not be determined because postaccident examination did not reveal any anomalies that would have precluded normal operation. - [NTSB WPR11LA278](https://openairdocs.org/ntsb/WPR11LA278.md): Air Tractor AT-502 · Blackfoot, ID · Accident · No injuries · Limited investigation · Final report · Jun 21, 2011 · N1515P · Substantial damage > A partial loss of engine power during takeoff for undetermined reasons. - [NTSB CEN11IA106](https://openairdocs.org/ntsb/CEN11IA106.md): Piper PA-46-500TP · Olathe, KS · Incident · No injuries · Incident investigation · Final report · Oct 21, 2010 · N767TP · No damage > The loss of engine power for undetermined reasons. - [NTSB DFW08LA167](https://openairdocs.org/ntsb/DFW08LA167.md): Air Tractor AT-502B · Bethany, MO · Accident · No injuries · Limited investigation · Final report · Jun 24, 2008 · N5005G · Substantial damage > The pilot's decision to take off with a known deficiency. ## 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 ('52032', '52034') 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" = '342')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb-events/342/cases?engine=52032 --- 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.