# NTSB investigations: Accessory drives 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 ERA23LA272](https://openairdocs.org/ntsb/ERA23LA272.md): Air Tractor AT802 · Wellington, FL · Accident · No injuries · Class 3 · Limited · Final report · Jun 20, 2023 · N3069S · Substantial damage > Wear of the fuel control unit drive shaft and the corresponding fuel pump drive gear, which resulted in the disengagement of the fuel control unit from the fuel pump, a decrease in fuel flow, and a loss of engine power. - [NTSB CEN22FA317](https://openairdocs.org/ntsb/CEN22FA317.md): Bell UH-1H · Chapelle, NM · Accident · 4 fatal · Class 3 · Field · Final report · Jul 17, 2022 · N911SZ · Destroyed > The total loss of engine power due to the fatigue failure of the starter-generator input (zerol) gear which failed due to poor maintenance. Contributing to the accident was the unsuccessful autorotation complicated by the setting sun and high density altitude. - [NTSB CEN21LA287](https://openairdocs.org/ntsb/CEN21LA287.md): Grumman G164 · Sedgwick, AR · Accident · No injuries · Class 3 · Limited · Final report · Jun 20, 2021 · N62375 · Substantial damage > The total loss of engine power due to the failure and disengagement of the torque sensor assembly front spur gear from its splined shouldered shaft due to a loose self-locking nut. - [NTSB CEN20FA035](https://openairdocs.org/ntsb/CEN20FA035.md): Bell 407 · Gulf of Mexico (Gulf of Mexico) · Accident · 2 fatal · Class 3 · Field · Final report · Dec 7, 2019 · N79LP · Destroyed > A total loss of engine power due to the failure of the engine’s Nos. 3 and 4 bearings and the power turbine pinion gear, and subsequent loss of main rotor rpm, which resulted in a loss of control and impact with the water. - [NTSB ENG17IA027](https://openairdocs.org/ntsb/ENG17IA027.md): Boeing 737 7H4 · Washington, DC · Incident · No injuries · Incident investigation · Final report · Jun 3, 2017 · N765SW · Minor damage > The failure the control alternator gearshaft, which disconnected the accessory gearbox from the rest of the engine and resulted in an uncommanded in-flight shutdown of the left engine and subsequent flight diversion. The control alternator gearshaft failed… - [NTSB ENG17IA017](https://openairdocs.org/ntsb/ENG17IA017.md): Douglas DC 9 83 · Dayton, OH · Incident · No injuries · Incident investigation · Final report · Mar 19, 2017 · N881GA · No damage > The probable cause of the No. 2 (right) engine fire was an uncontained generator failure. Deformed rotating generator components and/or metal fragments radially released by the generator severed the constant speed drive-to-oil cooler return line located… - [NTSB ERA14LA361](https://openairdocs.org/ntsb/ERA14LA361.md): Hiller UH 12E · Wadesboro, NC · Accident · No injuries · Limited investigation · Final report · Jul 26, 2014 · N107HA · Substantial damage > A partial loss of engine power due to the failure of the No. 2 engine accessory gearbox bearing for reasons that could not be determined based on the available information. - [NTSB WPR14LA014](https://openairdocs.org/ntsb/WPR14LA014.md): Bell Helicopter Textron 206L 1 · Seeley, CA · Accident · No injuries · Limited investigation · Final report · Oct 11, 2013 · N206KK · Destroyed > The total loss of engine power due to the failure of the No. 4 bearing. - [NTSB ENG13IA033](https://openairdocs.org/ntsb/ENG13IA033.md): Boeing 777 · Ugolny Airport, Russia · Incident · No injuries · Incident investigation · Final report · Jul 2, 2013 · HL8275 · No damage > The failure of the transfer gearbox resulting from the fracture and separation of the radial gearshaft from fatigue cracking as a result of a combination of high residual tensile stresses produced by local decarburization during the manufacturing process… - [NTSB WPR11LA423](https://openairdocs.org/ntsb/WPR11LA423.md): Arrow Falcon Exporters UH-1H · Stockton, CA · Accident · Minor injuries · Limited investigation · Final report · Sep 2, 2011 · N205PJ · Substantial damage > A total loss of engine power due to the separation of a tooth from the starter-generator drive gear, which resulted in failure of the engine oil pump and subsequent oil starvation. - [NTSB CEN11LA460](https://openairdocs.org/ntsb/CEN11LA460.md): Ayres S2R600 · Pine Bluff, AR · Accident · No injuries · Limited investigation · Final report · Jul 6, 2011 · N3101S · Substantial damage > The use of an incorrect mounting bolt by maintenance persons to attach the engine torque sensor, which resulted in an internal failure of the torque sensor and subsequent loss of engine power due to fuel starvation. - [NTSB ENG11IA035](https://openairdocs.org/ntsb/ENG11IA035.md): Boeing 757-232 · Atlanta, GA · Incident · Minor injuries · Incident investigation · Final report · Jun 21, 2011 · N6714Q · No damage > Fuel leaking from the fuel flow transmitter that ignited on contact with the engine’s hot cases which resulted in an engine undercowl fire. The fuel leak resulted from the fuel flow transmitter end housing backing off from the main housing, creating a gap… ## 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", '01057260')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb-findings/01057260/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.