# NTSB investigations: Amateur-built UNKNOWN ENG: 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. Page 1 of 2 · 55 cases ## Latest cases - [NTSB CEN26LA293](https://openairdocs.org/ntsb/CEN26LA293.md): Gildea William D Jabiru Calypso · Lake Isabella, MI · Accident · No injuries · Class 3 · Limited · Investigation open · Aug 14, 2026 · N495JG - [NTSB ANC26LA049](https://openairdocs.org/ntsb/ANC26LA049.md): William F Schoen RV-7 · Alpine, CO · Accident · Minor injuries · Class 4 · Limited · Investigation open · Jun 10, 2026 · N727BN · Substantial damage - [NTSB ERA25LA368](https://openairdocs.org/ntsb/ERA25LA368.md): Elmore Travis C Searey · Rotonda West, FL · Accident · No injuries · Class 3 · Limited · Preliminary report · Sep 28, 2025 · N2090S · Substantial damage > On September 28, 2025, at 1126 eastern daylight time, an experimental, amateur-built Searey, N2090S, was substantially damaged when it was involved in an accident near Stump Pass, Florida. The private pilot sustained minor injuries. The airplane was operated… - [NTSB WPR25FA127](https://openairdocs.org/ntsb/WPR25FA127.md): Azalea Saberwing · Justin, TX · Accident · 1 fatal · Class 3 · Field · Preliminary report · Apr 12, 2025 · N121DF · Destroyed > On April 11, 2025, about 1906 central daylight time (CDT), an experimental amateur-built Azalea Aviation LLC Saberwing, N121DF, was destroyed when it was involved in an accident near Justin, Texas. The pilot was fatally injured. The airplane was operated as a… - [NTSB WPR24LA159](https://openairdocs.org/ntsb/WPR24LA159.md): Nanchang China CJ-6A · Peoria, AZ · Accident · No injuries · Class 3 · Limited · Final report · May 21, 2024 · N4182C · Substantial damage > The partial loss of engine power during cruise flight due to the improper installation of the master connecting rod main bushing set screws, which backed off and allowed the main bushing to shift, resulting in scoring damage on the crankshaft that led to the… - [NTSB WPR23LA314](https://openairdocs.org/ntsb/WPR23LA314.md): Reynolds Ronald B Team Acft Z-MAX · Rigby, ID · Accident · Serious injuries · Class 3 · Limited · Final report · Aug 9, 2023 · N440ZM · Substantial damage > The loss of engine power during takeoff due to inadequately secured wires, which resulted in the wearing of the wires’ sheaths and the grounding of the airplane’s electrical system. Contributing to the accident was the pilot’s failure to maintain airplane… - [NTSB CEN23LA152](https://openairdocs.org/ntsb/CEN23LA152.md): Vans RV6 · Goldsby, OK · Accident · Minor injuries · Class 3 · Limited · Final report · Apr 8, 2023 · N48PS · Substantial damage > The engine electronic ignition system became disconnected, which resulted in a partial loss of engine power. - [NTSB WPR22LA035](https://openairdocs.org/ntsb/WPR22LA035.md): Sonex Waiex B · Laveen Village, AZ · Accident · Minor injuries · Class 3 · Limited · Final report · Nov 15, 2021 · N535D · Substantial damage > Failure of the rocker swivel assembly due to either wear or corrosion, which resulted in a loss of engine power. - [NTSB WPR21LA094](https://openairdocs.org/ntsb/WPR21LA094.md): Randy Wayne Maloney M1 · Eagle Point, OR · Accident · Minor injuries · Class 3 · Limited · Final report · Jan 21, 2021 · N322TR · Destroyed > A partial loss of engine power for reasons that could not be determined based on available evidence. - [NTSB WPR21LA071](https://openairdocs.org/ntsb/WPR21LA071.md): Co Z Cozy · Compton, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Nov 17, 2020 · N82V · Substantial damage > The partial loss of engine power due to an improperly installed sparkplug. - [NTSB WPR20LA007](https://openairdocs.org/ntsb/WPR20LA007.md): Hiller UH 12E · Susanville, CA · Accident · Minor injuries · Class 3 · Limited · Final report · Oct 14, 2019 · N131HA · Substantial damage > A partial loss of engine power due to multiple overtemperature events and a hot start event, which resulted in thermally damaged internal components of the engine. Contributing to the accident was the lack of suitable terrain on which to perform the forced… - [NTSB CEN19LA152](https://openairdocs.org/ntsb/CEN19LA152.md): Rand Robinson KR2 · Poplar Grove, IL · Accident · Minor injuries · Class 3 · Limited · Final report · May 26, 2019 · N886MJ · Substantial damage > The loss of engine power due to vapor lock of the throttle body injection system. - [NTSB CEN19FA144](https://openairdocs.org/ntsb/CEN19FA144.md): Vans RV6 · Chillicothe, OH · Accident · 1 fatal · Class 2 · Field · Final report · May 18, 2019 · N596JB · Destroyed > The pilot's failure to maintain control of the airplane following an intermittent loss of engine power during cruise flight that resulted in him impacting trees. The reason for the loss of engine power could not be determined based on the available… - [NTSB ERA19FA020](https://openairdocs.org/ntsb/ERA19FA020.md): Bowers Flybaby · Milton, FL · Accident · 1 fatal · Field investigation · Final report · Oct 19, 2018 · N107KW · Substantial damage > A loss of engine power for reasons that could not be determined, and the pilot's subsequent exceedance of the airplane's critical angle of attack, which resulted in an aerodynamic stall at low altitude. - [NTSB WPR18FA200](https://openairdocs.org/ntsb/WPR18FA200.md): De Havilland DH112 Venom · Sheboygan, WI · Accident · 1 fatal · Field investigation · Final report · Jul 20, 2018 · N747J · Destroyed > The airplane's encounter with wake turbulence from the lead airplane in the formation flight, which resulted in a compressor stall and the airplane's subsequent inability to climb. - [NTSB WPR18LA006](https://openairdocs.org/ntsb/WPR18LA006.md): Nanchang China CJ 6 · Buckeye, AZ · Accident · Serious injuries · Class 3 · Limited · Final report · Oct 9, 2017 · N8NW · Substantial damage > The failure of the fuel pump’s diaphragm which resulted in fuel system contamination from air and or oil and caused the engine to lose power. - [NTSB WPR17LA094](https://openairdocs.org/ntsb/WPR17LA094.md): Yakovlev YAK 52 · Porterville, CA · Accident · Minor injuries · Limited investigation · Final report · Apr 29, 2017 · N132MD · Substantial damage > A partial loss of engine power due to contaminants in the fuel system that decreased the fuel flow, the source of which could not be determined. - [NTSB WPR17LA067](https://openairdocs.org/ntsb/WPR17LA067.md): Guarino Vans · Marysville, CA · Accident · Minor injuries · Limited investigation · Final report · Feb 24, 2017 · N470LM · Substantial damage > A partial loss of engine power for reasons that could not be determined due to the fragmentation of the electrical system. - [NTSB ERA17LA007](https://openairdocs.org/ntsb/ERA17LA007.md): James Bruton Flying Flea · Plymouth, CT · Accident · Serious injuries · Limited investigation · Final report · Oct 6, 2016 · N83165 · Substantial damage > A partial loss of engine power for reasons that could not be determined based on the available information. - [NTSB ANC16LA047](https://openairdocs.org/ntsb/ANC16LA047.md): Aeropro CZ A220 · McCarthy, AK · Accident · No injuries · Limited investigation · Final report · Jul 19, 2016 · N151J · Substantial damage > The pilot’s failure to maintain directional control during the takeoff roll, which resulted in a loss of control and impact with terrain. Contributing to the accident were engine power surges due to the bent carburetor throttle valve lever. - [NTSB WPR16LA134](https://openairdocs.org/ntsb/WPR16LA134.md): Bell OH 58A · Brawley, CA · Accident · No injuries · Limited investigation · Final report · Jul 2, 2016 · N6251G · Substantial damage > The engine's degraded performance due to excessive wear of the engine bleed valve, which prevented it from closing during the accident flight. Contributing to the accident was the operator's failure to overhaul the bleed valve within the… - [NTSB WPR16LA110](https://openairdocs.org/ntsb/WPR16LA110.md): Seguin Quickie · Mojave, CA · Accident · Minor injuries · Limited investigation · Final report · May 13, 2016 · N68TQ · Destroyed > A loss of engine power for reasons that could not be determined based on the available information. - [NTSB WPR16LA088](https://openairdocs.org/ntsb/WPR16LA088.md): Thomas D. Parkes Lancair ES · Prescott, AZ · Accident · No injuries · Limited investigation · Final report · Mar 10, 2016 · N44AZ · Substantial damage > A partial loss of engine power due to an over-temperature event, which thermally damaged the blade tips of the turbocharger wheel and resulted in a slowing or stoppage in the rotation of the turbocharger. - [NTSB ERA15FA353](https://openairdocs.org/ntsb/ERA15FA353.md): Aero Vodochody L39 · Oneida, TN · Accident · 1 fatal · Field investigation · Final report · Sep 12, 2015 · N139RT · Destroyed > The pilot's failure to maintain airplane control following a partial loss of engine power during initial climb. The reason for the partial loss of engine power could not be determined due to extensive postimpact damage. - [NTSB WPR15LA235](https://openairdocs.org/ntsb/WPR15LA235.md): Cleveland Allan B Nieuport 11# · Bellingham, WA · Accident · Minor injuries · Limited investigation · Final report · Aug 7, 2015 · N917AB · Substantial damage > A partial loss of engine power for reasons that could not be determined because postaccident examination revealed no mechanical malfunctions or anomalies that would have precluded normal operation. - [NTSB WPR15LA230](https://openairdocs.org/ntsb/WPR15LA230.md): Grumman G164 - B · Princeton, CA · Accident · No injuries · Limited investigation · Final report · Aug 4, 2015 · N48452 · Substantial damage > The loss of engine power during an agricultural application flight due to a cylinder failure. - [NTSB ERA15LA291](https://openairdocs.org/ntsb/ERA15LA291.md): Sontonastaso Mosquito · Winchendon, MA · Accident · No injuries · Limited investigation · Final report · Jul 29, 2015 · N285XE · Substantial damage > A partial loss of engine power due to a faulty electrical wiring crimp in the engine’s ignition system. - [NTSB ERA15LA205](https://openairdocs.org/ntsb/ERA15LA205.md): Jerome D Fischer RV-7 · Bartow, GA · Accident · Minor injuries · Limited investigation · Final report · May 5, 2015 · N364SJ · Substantial damage > The pilot's use of the improper fuel grade for the engine, which resulted in detonation, engine damage, and loss of engine power. - [NTSB ERA15LA197](https://openairdocs.org/ntsb/ERA15LA197.md): James Kilroy Pitts Model 12 · LaGrange, GA · Accident · Serious injuries · Limited investigation · Final report · Apr 22, 2015 · N488WT · Substantial damage > A partial loss of engine power after takeoff 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 WPR15LA131](https://openairdocs.org/ntsb/WPR15LA131.md): Mccurry Charles P F 1 Rocket · Sedona, AZ · Accident · Serious injuries · Limited investigation · Final report · Mar 21, 2015 · N747MC · Substantial damage > The partial loss of engine power during final approach for reasons that could not be determined during postaccident examination of the engine. - [NTSB ERA15FA139](https://openairdocs.org/ntsb/ERA15FA139.md): Adams Donald L DA1 · Sebring, FL · Accident · 1 fatal · Field investigation · Final report · Mar 2, 2015 · N797A · Substantial damage > A partial loss of engine power for reasons that could not be determined based on the available evidence. - [NTSB CEN15LA023](https://openairdocs.org/ntsb/CEN15LA023.md): Tuberville Zodiac XL · Mountain Home, AR · Accident · Serious injuries · Limited investigation · Final report · Oct 21, 2014 · N601WR · Substantial damage > The partial loss of engine power during takeoff for reasons that could not be determined because postaccident engine examinations revealed no anomalies that would have precluded normal operation. - [NTSB WPR14LA340](https://openairdocs.org/ntsb/WPR14LA340.md): Hughes 269C · Darrington, WA · Accident · No injuries · Limited investigation · Final report · Aug 11, 2014 · N7432F · Substantial damage > Maintenance personnel’s failure to secure the throttle mount bracket during a recent engine installation, which resulted in the loss of throttle movement and an inability to control engine power. - [NTSB CEN14FA400](https://openairdocs.org/ntsb/CEN14FA400.md): Larry Ketterling FEW P-51 Mustang · Lisbon, ND · Accident · 1 fatal · Field investigation · Final report · Aug 1, 2014 · N116LK · Destroyed > The partial loss of engine power for a reason that could not be determined because of extensive impact and postcrash fire damage, and the pilot's failure to maintain adequate airspeed, which resulted in the airplane's wing exceeding its critical… - [NTSB ERA14LA351](https://openairdocs.org/ntsb/ERA14LA351.md): Siler Ronald E Ultrastar · Halifax, PA · Accident · Serious injuries · Limited investigation · Final report · Jul 23, 2014 · N4425W · Substantial damage > A total loss of engine power for reasons that could not be determined because the engine was not recovered. Contributing to the accident was the pilot's failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle-of-attack during… - [NTSB WPR14LA242](https://openairdocs.org/ntsb/WPR14LA242.md): Adams Dragonfly · Mesa, AZ · Accident · No injuries · Limited investigation · Final report · Jun 12, 2014 · N85TL · Substantial damage > A partial loss of engine power due to a reduction in the No. 3 cylinder’s compression as a result of the exhaust valve not having consistent uniform contact with the cylinder head valve seat. - [NTSB CEN14LA244](https://openairdocs.org/ntsb/CEN14LA244.md): Crawford Preceptor Ultra PUP · Mabel, MN · Accident · Minor injuries · Limited investigation · Final report · May 17, 2014 · N1171Q · Substantial damage > The loss of engine power as a result of carburetor icing. - [NTSB CEN13LA383](https://openairdocs.org/ntsb/CEN13LA383.md): Vink Robert D Youngster · Grand Haven, MI · Accident · Serious injuries · Limited investigation · Final report · Jun 30, 2013 · N258RV · Substantial damage > The loss of engine power due to carburetor icing. - [NTSB ERA13LA263](https://openairdocs.org/ntsb/ERA13LA263.md): Wilson William M Cricket MC12 · Doylestown, PA · Accident · 1 fatal · Limited investigation · Final report · Jun 1, 2013 · N2SZ · Substantial damage > The pilot's failure to abort the takeoff after detecting the airplane’s degraded performance. Contributing to the accident were the likely loss of power from the left engine for reasons that could not be determined during the postaccident examination of the… - [NTSB CEN12LA637](https://openairdocs.org/ntsb/CEN12LA637.md): Sackman Sackman Special · Ste. Genevieve, MO · Accident · No injuries · Limited investigation · Final report · Aug 11, 2012 · N4760R · Substantial damage > The loss of engine power during a low level maneuver due to oil starvation for reasons that could not be determined during postaccident examination. - [NTSB CEN12LA530](https://openairdocs.org/ntsb/CEN12LA530.md): Williams John T-51 Mustang · Oshkosh, WI · Accident · Serious injuries · Limited investigation · Final report · Aug 7, 2012 · N151TA · Substantial damage > The separation of an engine cooling hose from the radiator. - [NTSB CEN11LA671](https://openairdocs.org/ntsb/CEN11LA671.md): Fisher Michael E Hyster · Lake Jackson, TX · Accident · Serious injuries · Limited investigation · Final report · Aug 13, 2011 · N7167S · Substantial damage > The improper maintenance of the throttle control cable, which resulted in the engine going to idle power after takeoff. - [NTSB CEN11LA449](https://openairdocs.org/ntsb/CEN11LA449.md): Abbey Victor RV9-A · Leander, TX · Accident · Minor injuries · Limited investigation · Final report · Jun 30, 2011 · N59VA · Substantial damage > The partial loss of engine power for reasons that could not be determined because examination of the engine did not reveal any anomalies that would have precluded normal operation. - [NTSB ERA11CA355](https://openairdocs.org/ntsb/ERA11CA355.md): Dotson William P Sngl Seat Hawk Arrow · Carthage, NC · Accident · No injuries · Data collection · Final report · Jun 20, 2011 · N4209F · Substantial damage > A partial loss of engine power due to the pilot’s improper installation of the engine’s No. 1 cylinder spark plugs. - [NTSB ERA11LA213](https://openairdocs.org/ntsb/ERA11LA213.md): Holst Lawrence E VP-1 · Calhoun, GA · Accident · Minor injuries · Limited investigation · Final report · Mar 25, 2011 · N770VP · Substantial damage > A partial loss of engine power during initial climb due to an over-lean carburetor setting. Contributing to the accident was the pilot's improper adjustment of the engine's carburetor during construction. - [NTSB CEN10CA376](https://openairdocs.org/ntsb/CEN10CA376.md): Wells Terry Hula Girl · Wellington, CO · Accident · No injuries · Data collection · Final report · Jul 3, 2010 · N301TW · Substantial damage > A partial loss of engine power due to the inadequate design of the engine cowling. - [NTSB WPR10LA310](https://openairdocs.org/ntsb/WPR10LA310.md): Rice KR-2 · Richfield, UT · Accident · Serious injuries · Limited investigation · Final report · Jun 23, 2010 · N44729 · Substantial damage > A loss of engine power during initial climb due to a carburetor malfunction. - [NTSB ERA10LA050](https://openairdocs.org/ntsb/ERA10LA050.md): Grumman Aircraft ENG G-111 · Ft Pierce, FL · Accident · Minor injuries · Limited investigation · Final report · Nov 5, 2009 · N120FB · Substantial damage > A total loss of left engine power and subsequent failure of the airplane to maintain airspeed and altitude on the remaining engine for undetermined reasons. - [NTSB ERA09LA498](https://openairdocs.org/ntsb/ERA09LA498.md): Hahn R-W22 Tiger Moth Rep · Symrna, TN · Accident · Serious injuries · Limited investigation · Final report · Sep 1, 2009 · N318JT · Destroyed > A loss of engine power for undetermined reasons. - [NTSB WPR09LA308](https://openairdocs.org/ntsb/WPR09LA308.md): Mayo RV-6A · Cottonwood, AZ · Accident · 2 fatal · Limited investigation · Final report · Jun 23, 2009 · N413RV · Substantial damage > The partial loss of engine power for undetermined reasons, and the pilot's failure to maintain an adequate airspeed, which resulted in an inadvertent stall/spin. Next page: https://openairdocs.org/ntsb-events/342/cases.md?engine=99999&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_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 ('99999') 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=99999 --- 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.