# Propeller controlling system - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft propeller/rotor](https://openairdocs.org/ntsb-findings/0104) › [Propeller system](https://openairdocs.org/ntsb-findings/010461) › Propeller controlling system - NTSB code: 01046120 - Cases: 25 - In the probable cause: 23 - Fatal cases: 3 - All cases: https://openairdocs.org/ntsb-findings/01046120/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01046120/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01046120 ## Cases per year (in the probable cause / all) - 2008: 4 / 4 - 2009: 1 / 1 - 2010: 2 / 3 - 2011: 1 / 1 - 2012: 1 / 1 - 2013: 2 / 2 - 2014: 2 / 2 - 2016: 1 / 1 - 2019: 4 / 4 - 2020: 1 / 1 - 2022: 0 / 1 - 2023: 2 / 2 - 2024: 2 / 2 ## Defining events in these cases - [Powerplant sys/comp malf/fail](https://openairdocs.org/ntsb-events/340): 9 cases - [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 3 cases - [Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342): 3 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 3 cases - [Unknown or undetermined](https://openairdocs.org/ntsb-events/000): 2 cases - [Collision during takeoff/land](https://openairdocs.org/ntsb-events/490): 1 cases - [Turbulence encounter](https://openairdocs.org/ntsb-events/360): 1 cases - [Loss of engine power (total)](https://openairdocs.org/ntsb-events/341): 1 cases - [Part(s) separation from AC](https://openairdocs.org/ntsb-events/338): 1 cases - [Loss of control on ground](https://openairdocs.org/ntsb-events/230): 1 cases ## Aircraft models (registry) - [Piper PA-34-200T](https://openairdocs.org/model/piper-pa-34-200t): 1 cases - [Piper PA-30](https://openairdocs.org/model/piper-pa-30): 1 cases - [Mooney M20M](https://openairdocs.org/model/mooney-m20m): 1 cases - [Mooney M20J](https://openairdocs.org/model/mooney-m20j): 1 cases - [Hawker SEA FURY ISS-25](https://openairdocs.org/model/hawker-sea-fury-iss-25): 1 cases - [Hoac-Austria HK 36R SUPER DIMONA](https://openairdocs.org/model/hoac-austria-hk-36r-super-dimona): 1 cases - [Dehavilland BEAVER DHC-2 MK.3](https://openairdocs.org/model/dehavilland-beaver-dhc-2-mk-3): 1 cases - [Cessna 182T](https://openairdocs.org/model/cessna-182t): 1 cases - [Beech A36](https://openairdocs.org/model/beech-a36): 1 cases - [Beech C35](https://openairdocs.org/model/beech-c35): 1 cases ## Other findings in the same cases - [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 4 cases - [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 3 cases - [Installation](https://openairdocs.org/ntsb-findings/02062035) (Personnel issues): 3 cases - [Delayed action](https://openairdocs.org/ntsb-findings/02041025) (Personnel issues): 3 cases - [Tailwind](https://openairdocs.org/ntsb-findings/03034015) (Environmental issues): 2 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 2 cases - [Total experience w/ equipment](https://openairdocs.org/ntsb-findings/02031025) (Personnel issues): 2 cases - [Climb rate](https://openairdocs.org/ntsb-findings/01062035) (Aircraft): 2 cases - [Engine (reciprocating), general](https://openairdocs.org/ntsb-findings/01058500) (Aircraft): 2 cases - [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 1 cases ## Newest cases - [NTSB ANC24LA064](https://openairdocs.org/ntsb/ANC24LA064), Jul 13, 2024: Dehavilland DHC-2T (N535KT), Petersville, AK, substantial damage. Probable cause: An in-flight loss of thrust due to an uncommanded feathering of the propeller for reasons that could not be determined. - [NTSB ERA24LA208](https://openairdocs.org/ntsb/ERA24LA208), May 2, 2024: Admore International Jets Aircam (N848HP), DeLand, FL, substantial damage. Probable cause: The uncommanded movement of the left propeller into reverse during approach for undetermined reasons, resulting in an in-flight loss of control of the airplane at low altitude during approach. - [NTSB WPR23LA283](https://openairdocs.org/ntsb/WPR23LA283), Jul 20, 2023: Beech C35 (N620D), Rock Springs, WY, substantial damage. Probable cause: Maintenance personnel’s failure to properly secure the propeller pitch control rod castellated nut hardware, which resulted in an in-flight failure of the pitch control bearing and subsequent loss of… - [NTSB ERA23LA279](https://openairdocs.org/ntsb/ERA23LA279), Jun 25, 2023: Edmisten Robert Eugene SR Rans S-14 Airaile (N528RE), Bonaire, GA, substantial damage. Probable cause: The pilot’s failure to properly adjust the propeller’s pitch angle, which resulted in a loss of thrust and an inability to maintain altitude. - [NTSB DCA22FA082](https://openairdocs.org/ntsb/DCA22FA082), Feb 16, 2022: Joby Aero JAS4-2 (N542AJ), Jolon, CA, substantial damage. Probable cause: The separation of a propeller blade during expansion flight testing that resulted in cascading effects to include the separation of multiple propulsion motor/propeller assemblies and the loss of… - [NTSB ERA20LA077](https://openairdocs.org/ntsb/ERA20LA077), Jan 14, 2020: Velocity Elite RG (N78BM), St. Petersburg, FL, substantial damage. Probable cause: A failure of the propeller pitch change electric motor, which resulted in an improper setting for takeoff and a subsequent runway overrun. Also causal was the inadequate maintenance and inspection of… - [NTSB CEN19LA313](https://openairdocs.org/ntsb/CEN19LA313), Sep 3, 2019: Jackson Velocity (N2XF), Mack, CO, substantial damage. Probable cause: A propeller overspeed due to failure of the electronic ignition timing ring attachment screws, and a runway overrun during the subsequent forced landing. - [NTSB CEN19LA295](https://openairdocs.org/ntsb/CEN19LA295), Aug 29, 2019: Air Tractor AT502 (N8517Q), Olney, TX, substantial damage. Probable cause: A loss of thrust control due to a propeller surge event, which resulted in a forced landing shortly after takeoff. - [NTSB ERA19LA232](https://openairdocs.org/ntsb/ERA19LA232), Jul 19, 2019: Vans RV7 (N849GS), Ocean City, MD, substantial damage. Probable cause: 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… - [NTSB ERA19LA214](https://openairdocs.org/ntsb/ERA19LA214), Jul 4, 2019: Pipistrel Sinus (N269PW), Haverhill, MA, substantial damage. Probable cause: The pilot's failure to utilize the proper procedure and unfeather the motorized glider’s propeller prior to an in-flight engine restart, resulting in a lack of thrust and subsequent forced landing. NTSB has coded findings and defining events since 2008; earlier cases used its older occurrence and cause codes and aren't counted. Findings: https://openairdocs.org/ntsb-findings.md. Defining events: https://openairdocs.org/ntsb-events.md. Phases of flight: https://openairdocs.org/ntsb-phases.md. Every investigation, filtered by finding, event, phase, state, year or model: https://openairdocs.org/ntsb.md (for example ?state=MI&fatal=1). NTSB's definitions: Accident and incident, 49 CFR 830.2 (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-VIII/part-830/subpart-A/section-830.2), CICTT occurrence categories (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/OccurrenceCategoryDefinitions.pdf), CICTT phases of flight (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/PhaseofFlightDefinitions.pdf), and NTSB coding manual, before 2008 (PDF) (https://www.ntsb.gov/GILS/Documents/codman.pdf). NTSB publishes no definitions for its findings, only their names. --- 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.