# NTSB investigations: Oil system 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 CEN24LA239](https://openairdocs.org/ntsb/CEN24LA239.md): Thrush S2R · Hebron, ND · Accident · No injuries · Class 3 · Limited · Final report · Jun 17, 2024 · N529KC · Substantial damage > Foreign object debris in the Negative Torque Sensing (NTS) system check valve, which impeded the flow of oil to the NTS system and the propeller governor (PG) reset piston, resulting in a total loss of engine power and an off-airport forced landing.… - [NTSB WPR24FA132](https://openairdocs.org/ntsb/WPR24FA132.md): Bell 206-L4 · Anaconda, MT · Accident · 1 fatal · Class 3 · Field · Final report · Apr 26, 2024 · N988B · Destroyed > A total loss of engine power due to a loss of cooling oil to the turbine-to-compressor coupling shaft and subsequent fracture of the shaft at an altitude too low for the pilot to complete a successful autorotation. Contributing to the accident was carbon… - [NTSB WPR24LA041](https://openairdocs.org/ntsb/WPR24LA041.md): Bell OH-58A · Brawley, CA · Accident · No injuries · Class 3 · Limited · Final report · Nov 21, 2023 · N158TR · Substantial damage > A total loss of engine power due to the failure of the No. 8 bearing and the subsequent failure of the scavenge oil pump. - [NTSB CEN19LA231](https://openairdocs.org/ntsb/CEN19LA231.md): Ayres S2R · Breckenridge, MI · Accident · No injuries · Class 3 · Limited · Final report · Jul 21, 2019 · N766BF · Substantial damage > A total loss of engine power due to a lack of oil in the engine. The source of the inflight oil leak could not be determined based on the available information. - [NTSB WPR18LA269](https://openairdocs.org/ntsb/WPR18LA269.md): Robinson R44 · Wahiawa, HI · Accident · No injuries · Class 3 · Limited · Final report · Sep 18, 2018 · N632NV · Substantial damage > Loss of oil in flight as a result of a loose oil filter adapter which resulted in the pilot initiating an immediate landing to an open field. Contributing to the accident was the pilot's manipulation of the throttle that led to a reduction in rotor rpm, which… - [NTSB WPR17LA133](https://openairdocs.org/ntsb/WPR17LA133.md): Eurocopter EC 130 B4 · Boulder City, NV · Accident · Minor injuries · Limited investigation · Final report · Jun 27, 2017 · N151GC · Substantial damage > A loss of engine power due to the failure of the manufacturer to reinstall the oil filter after it was removed for inspection, which led to coke pollution that obstructed the oil jet and resulted in the subsequent oil starvation of the axial compressor rear… - [NTSB CEN17IA094](https://openairdocs.org/ntsb/CEN17IA094.md): Eurocopter Deutschland MBB BK 117 C-2 · Sioux Falls, SD · Incident · No injuries · Class 2 · Incident · Final report · Jan 27, 2017 · N911MK · Minor damage > The gas generator rear bearing oil scavenge line blocked with coke, which resulted in a failed rear bearing due to an excess of oil lubrication. Contributing to the incident was the operator not completely performing the maintenance items and not utilizing an… - [NTSB ERA15LA280](https://openairdocs.org/ntsb/ERA15LA280.md): MD Helicopter 369FF · Vega Baja, PR · Accident · No injuries · Class 3 · Limited · Final report · Jul 24, 2015 · N5842Z · Substantial damage > A total loss of engine power due to insufficient lubrication to the engine's No. 2 bearing, which resulted in the failure of the bearing and a subsequent forced landing. - [NTSB ERA15LA138](https://openairdocs.org/ntsb/ERA15LA138.md): Bell 206 · Sevierville, TN · Accident · No injuries · Limited investigation · Final report · Feb 15, 2015 · N3176L · Substantial damage > An uncontained engine failure, which resulted from insufficient lubrication of the No. 4 bearing due to carbon buildup on the filter screen of the bearing's oil supply nozzle. - [NTSB ERA14LA368](https://openairdocs.org/ntsb/ERA14LA368.md): Gulfstream-Schweizer A/C G-164B · Bonifay, FL · Accident · No injuries · Limited investigation · Final report · Jul 25, 2014 · N425LS · Substantial damage > A partial blockage of the No. 2 bearing oil nozzle jet by bearing material, which resulted in oil starvation and the subsequent failure of the No. 2 bearing and total loss of engine power. - [NTSB CEN14FA232](https://openairdocs.org/ntsb/CEN14FA232.md): Bell 407 · Telluride, CO · Accident · No injuries · Field investigation · Final report · May 3, 2014 · N407MH · Substantial damage > The failure of the power turbine thrust (No. 5) bearing due to overheating as a result of oil starvation, which led to the engine failure. Also causal to the accident was an undocumented repair to the gearbox cover oil delivery tube port during which an… - [NTSB ERA13LA421](https://openairdocs.org/ntsb/ERA13LA421.md): American Eurocopter AS350B2 · Canton, MS · Accident · Serious injuries · Limited investigation · Final report · Sep 20, 2013 · N810LE · Substantial damage > The pilot’s improper decision to continue flight with a low engine oil pressure warning light instead of landing immediately in accordance with the flight manual emergency checklist. Contributing to the accident was the maintenance technician’s failure to… - [NTSB ERA13IA313](https://openairdocs.org/ntsb/ERA13IA313.md): Bell Helicopter Textron Canada 206 · New York, NY · Incident · No injuries · Incident investigation · Final report · Jun 30, 2013 · N405MR · Minor damage > The improper maintenance decision to adjust the engine oil pressure regulator valve in response to high oil pressure indications rather than to properly troubleshoot the anomaly, which then allowed an existing oil supply path blockage to increase and led to… - [NTSB ERA12LA258](https://openairdocs.org/ntsb/ERA12LA258.md): Rotorcraft Developement OH-58C · McComb, MS · Accident · No injuries · Limited investigation · Final report · Mar 27, 2012 · N452MC · Substantial damage > A total loss of engine power due to oil starvation at the Nos. 5 and 8 engine bearings, which resulted in a catastrophic engine failure. - [NTSB ENG11IA021](https://openairdocs.org/ntsb/ENG11IA021.md): Bombardier DHC 8 402 · Pittsburgh, PA · Incident · No injuries · Incident investigation · Final report · Mar 17, 2011 · N339NG · Minor damage > the flight crew's delay in shutting down the left engine following an engine oil pressure master warning, which led to a hard rub inside the engine that served as an ignition point for a titanium fire. Contributing to the event was a PW150 No. 5 seal design… - [NTSB CEN09LA574](https://openairdocs.org/ntsb/CEN09LA574.md): Grumman Acft ENG Cor-Schweizer G-164A · Kimball, NE · Accident · No injuries · Limited investigation · Final report · Sep 8, 2009 · N6761Q · Substantial damage > A loss of engine power due to improper installation of an oil line fitting resulting in oil depletion. ## 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 f.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_findings.parquet' f WHERE starts_with(f."findingCode", '01057261')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb-findings/01057261/cases --- 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.