# AC generator-alternator - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Electrical power system](https://openairdocs.org/ntsb-findings/010224) › AC generator-alternator - NTSB code: 01022421 - Cases: 14 - In the probable cause: 12 - Fatal cases: 1 - All cases: https://openairdocs.org/ntsb-findings/01022421/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022421/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01022421 ## Cases per year (in the probable cause / all) - 2011: 2 / 2 - 2012: 2 / 4 - 2013: 1 / 1 - 2014: 2 / 2 - 2016: 1 / 1 - 2018: 2 / 2 - 2022: 1 / 1 - 2023: 1 / 1 ## Defining events in these cases - [Electrical system malf/failure](https://openairdocs.org/ntsb-events/332): 5 cases - [Loss of engine power (total)](https://openairdocs.org/ntsb-events/341): 2 cases - [Landing gear not configured](https://openairdocs.org/ntsb-events/095): 2 cases - [Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342): 1 cases - [Runway excursion](https://openairdocs.org/ntsb-events/300): 1 cases - [Landing gear collapse](https://openairdocs.org/ntsb-events/094): 1 cases - [Hard landing](https://openairdocs.org/ntsb-events/092): 1 cases - [Unknown or undetermined](https://openairdocs.org/ntsb-events/000): 1 cases ## Aircraft models (registry) - [Piper PA-32R-301T](https://openairdocs.org/model/piper-pa-32r-301t): 1 cases - [Piper PA-24-260](https://openairdocs.org/model/piper-pa-24-260): 1 cases - [Cirrus Design SR22T](https://openairdocs.org/model/cirrus-design-sr22t): 1 cases - [Cirrus Design SR22](https://openairdocs.org/model/cirrus-design-sr22): 1 cases - [Cessna P210N](https://openairdocs.org/model/cessna-p210n): 1 cases - [Cessna 182S](https://openairdocs.org/model/cessna-182s): 1 cases - [Beech 58P](https://openairdocs.org/model/beech-58p): 1 cases - [Beech 95-B55 (T42A)](https://openairdocs.org/model/beech-95-b55-t42a): 1 cases - [Beech A36](https://openairdocs.org/model/beech-a36): 1 cases - [Beech F33A](https://openairdocs.org/model/beech-f33a): 1 cases ## Other findings in the same cases - [Use of checklist](https://openairdocs.org/ntsb-findings/02063030) (Personnel issues): 4 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 4 cases - [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 2 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 2 cases - [Preflight inspection](https://openairdocs.org/ntsb-findings/02061510) (Personnel issues): 2 cases - [Descent/approach/glide path](https://openairdocs.org/ntsb-findings/01062040) (Aircraft): 2 cases - [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 2 cases - [Airspeed](https://openairdocs.org/ntsb-findings/01062010) (Aircraft): 2 cases - [Gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230) (Aircraft): 2 cases - [Battery/charger](https://openairdocs.org/ntsb-findings/01022432) (Aircraft): 2 cases ## Newest cases - [NTSB CEN24LA056](https://openairdocs.org/ntsb/CEN24LA056), Dec 5, 2023: Vans RV6 (N600VS), Fordyce, AR, substantial damage. Probable cause: The pilot’s failure to attain a proper touchdown point following an unidentified electrical system failure and subsequent partial loss of engine power, which resulted in a runway overrun and impact… - [NTSB ERA23LA064](https://openairdocs.org/ntsb/ERA23LA064), Nov 3, 2022: Beech 95-B55 (T42A) (N101DC), Athens, GA, substantial damage. Probable cause: The operator’s and the pilot’s continued operation of the airplane with a known electrical problem, resulting in a loss of electrical power and a gear-up landing. - [NTSB ERA18TA263](https://openairdocs.org/ntsb/ERA18TA263), Sep 23, 2018: Zenith CH 750 (N752VK), DeLeon Springs, FL, substantial damage. Probable cause: The pilot's operation of the airplane with the alternator switch in the off position, which allowed the selected battery to discharge and resulted in an ignition system failure and a total loss of… - [NTSB CEN18LA097](https://openairdocs.org/ntsb/CEN18LA097), Feb 8, 2018: Piper PA 24-260 (N9360P), Fargo, ND, substantial damage. Probable cause: The pilot's failure to use the published emergency procedures to manually extend the landing gear when an electrical failure precluded normal extension of the landing gear, resulting in the gear… - [NTSB ERA16LA305](https://openairdocs.org/ntsb/ERA16LA305), Aug 20, 2016: Dayton A Babcock Storm (N516VB), Eustis, FL, substantial damage. Probable cause: The pilot's failure to maintain directional control during an aborted takeoff. Contributing to the accident were the loss of engine power due to a malfunctioning alternator, which precipitated the… - [NTSB ERA14LA252](https://openairdocs.org/ntsb/ERA14LA252), May 21, 2014: Cessna 182 (N182PJ), Elkton, MD, substantial damage. Probable cause: The pilot’s failure to attain the proper touchdown point during a no-flap landing to a wet, down-sloping runway, and the airplane's dynamic hydroplaning after touchdown, which resulted in a runway… - [NTSB DCA14CA043](https://openairdocs.org/ntsb/DCA14CA043), Jan 27, 2014: General Atomics MQ-9 (CBP-159), Point Loma, CA, destroyed. Probable cause: intentional controlled ditching of the aircraft due to failure of the starter/generator supplying electrical power to the aircraft. - [NTSB WPR13LA237](https://openairdocs.org/ntsb/WPR13LA237), May 19, 2013: Piper PA-32R-301T (N8197W), Chandler, AZ, substantial damage. Probable cause: The failure of the alternator and/or battery, which prevented the operation of the landing gear extension system and resulted in the nose landing gear collapsing during the landing roll. - [NTSB ERA12LA450](https://openairdocs.org/ntsb/ERA12LA450), Jul 9, 2012: Beech A36 (N6672B), Johns Island, SC, substantial damage. Probable cause: The pilot's failure to complete the manual emergency gear extension after a loss of electrical power. Contributing to the accident was the pilot's decision to delegate the landing gear extension to a… - [NTSB CEN12FA251](https://openairdocs.org/ntsb/CEN12FA251), Apr 21, 2012: Cirrus Design SR22 (N110EB), Newcomerstown, OH, substantial damage, 1 fatal. Probable cause: The pilot’s loss of airplane control in instrument meteorological conditions due to his distraction by electrical system anomalies, which resulted in an uncontrolled descent. The reason for the… 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.