# NTSB investigations: Propeller governor 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 CEN24LA187](https://openairdocs.org/ntsb/CEN24LA187.md): Aviat A1 · Poole, NE · Accident · Serious injuries · Class 4 · Limited · Final report · Feb 11, 2024 · N122HU · Substantial damage > The non-certificated pilot’s failure to configure the airplane for takeoff, which resulted in a runway excursion. - [NTSB CEN24LA061](https://openairdocs.org/ntsb/CEN24LA061.md): Cessna 421C · McGregor, TX · Accident · No injuries · Class 3 · Limited · Final report · Dec 8, 2023 · N146TJ · Substantial damage > The failure of the spring pin in the right propeller governor, which precluded the pilot from controlling the propeller pitch to maintain engine rpm, resulting in a loss of engine thrust, excessive drag, and the subsequent forced landing to a field. - [NTSB WPR21LA208](https://openairdocs.org/ntsb/WPR21LA208.md): Boeing A75N1(PT17) · Hollister, CA · Accident · Minor injuries · Class 3 · Limited · Final report · May 26, 2021 · N75016 · Substantial damage > The improper installation of a relief valve spring that was shorter than the standard spring length, which slowed the response of the propeller governor to change the pitch of the blades during climbout, resulting in a partial loss of power. - [NTSB ERA19LA232](https://openairdocs.org/ntsb/ERA19LA232.md): Vans RV7 · Ocean City, MD · Accident · Minor injuries · Class 3 · Limited · Final report · Jul 19, 2019 · N849GS · Substantial damage > The disconnection of the propeller governor control arm from the propeller governor due to a missing attachment bolt, which resulted in a partial loss of engine power during takeoff when the governor control vibrated to a high pitch, low rpm setting. - [NTSB ERA19LA096](https://openairdocs.org/ntsb/ERA19LA096.md): Convair C131 · Atlantic Ocean (Atlantic Ocean) · Accident · 1 fatal · Limited investigation · Final report · Feb 8, 2019 · N145GT · Destroyed > The captain's decision to continue with the flight with a malfunctioning left engine propeller control and the subsequent loss of engine power on both engines for undetermined reasons, which resulted in ditching into the ocean. Contributing to the accident… - [NTSB WPR18FA131](https://openairdocs.org/ntsb/WPR18FA131.md): American Air Racing Thunder Mustang · Reno, NV · Accident · 1 fatal · Field investigation · Final report · May 2, 2018 · N352BT · Substantial damage > The pilot's failure to properly secure the engine coolant pump pulley during recent maintenance, which resulted in a loss of the engine's lubrication, cooling, and propeller control systems, and a forced landing, during which the airplane nosed over.… - [NTSB ERA18LA021](https://openairdocs.org/ntsb/ERA18LA021.md): Socata TB200 · Annapolis, MD · Accident · No injuries · Class 2 · Limited · Final report · Nov 10, 2017 · N207GT · Substantial damage > A loss of engine power for undetermined reasons after the disconnection of the propeller governor control due to inadequate securenment during maintenance. - [NTSB WPR16FA095](https://openairdocs.org/ntsb/WPR16FA095.md): Mooney M20K · Woodland, WA · Accident · 1 fatal · Field investigation · Final report · Apr 21, 2016 · N97119 · Substantial damage > The pilot's delay in recognizing that the airplane was not performing as expected and aborting the takeoff, which resulted in collision with a berm beyond the end of the runway. Contributing to the accident were the pilot's exceedance of the airplane's gross… - [NTSB CEN15IA365](https://openairdocs.org/ntsb/CEN15IA365.md): Beech V35 · Mount Vernon, OH · Incident · No injuries · Incident investigation · Final report · Aug 16, 2015 · N2059W · No damage > The loosening of the flyweight due to the installation of an improperly hardened flyweight carrier, which resulted in the overspeed of the propeller and engine and the subsequent in-flight separation of the propeller. - [NTSB CEN15LA298](https://openairdocs.org/ntsb/CEN15LA298.md): Cirrus Design SR22 · Houston, TX · Accident · Minor injuries · Limited investigation · Final report · Jul 7, 2015 · N422PB · Substantial damage > Maintenance personnel's improper installation of the propeller governor, which resulted in damage to the governor drive gear and its subsequent failure and a subsequent loss of engine power. - [NTSB CEN13LA414](https://openairdocs.org/ntsb/CEN13LA414.md): Ayres S2R-T41 · Coy, AR · Accident · Minor injuries · Limited investigation · Final report · Jul 10, 2013 · N2239B · Substantial damage > The propeller’s uncommanded reverse thrust during the landing flare due to improper rigging of the propeller’s governor linkage. - [NTSB CEN13LA346](https://openairdocs.org/ntsb/CEN13LA346.md): Rogers T-51 Mustang KIT · St Francis, KS · Accident · No injuries · Limited investigation · Final report · Jun 11, 2013 · N548RR · Substantial damage > Foreign debris in the propeller governor, which led to excessive wear in the governor and its subsequent in-flight failure. - [NTSB WPR12LA265](https://openairdocs.org/ntsb/WPR12LA265.md): Roetman Ryland K JR Eagle · Rexburg, ID · Accident · Serious injuries · Limited investigation · Final report · Jun 16, 2012 · N106BD · Substantial damage > A loss of engine oil pressure, which led to the subsequent uncommanded loss of thrust and decrease in the propeller rpm during a low-level aerobatic maneuver. - [NTSB CEN11LA512](https://openairdocs.org/ntsb/CEN11LA512.md): WSK PZL Mielec M-18A · Anderson, IN · Accident · No injuries · Limited investigation · Final report · Jul 25, 2011 · N92640 · Substantial damage > The fatigue failure of the propeller governor speeder spring, which resulted in the pilot’s inability to control engine output power. - [NTSB WPR09LA197](https://openairdocs.org/ntsb/WPR09LA197.md): Raytheon A36 · Lopez Island, WA · Accident · No injuries · Limited investigation · Final report · Apr 16, 2009 · N464TJ · Substantial damage > A loss of engine power during cruise flight due to oil starvation. The oil starvation event was due to the failure of maintenance personnel to tighten the aft mounting nuts for the newly installed propeller governor and the pilot’s failure to secure the oil… - [NTSB SEA08IA217](https://openairdocs.org/ntsb/SEA08IA217.md): Diamond DA 40 · San Carlos, CA · Incident · No injuries · Incident investigation · Final report · Sep 13, 2008 · N419JS · Minor damage > The improper assembly of the governor during manufacture. ## 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", '01046122')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb-findings/01046122/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.