# Pump, main - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Hydraulic power system](https://openairdocs.org/ntsb-findings/010229) › Pump, main - NTSB code: 01022913 - Cases: 7 - In the probable cause: 7 - Fatal cases: 0 - All cases: https://openairdocs.org/ntsb-findings/01022913/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022913/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01022913 ## Cases per year (in the probable cause / all) - 2009: 1 / 1 - 2011: 1 / 1 - 2012: 1 / 1 - 2018: 1 / 1 - 2020: 2 / 2 - 2021: 1 / 1 ## Defining events in these cases - [Landing gear collapse](https://openairdocs.org/ntsb-events/094): 3 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 2 cases - [Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333): 1 cases - [Landing gear not configured](https://openairdocs.org/ntsb-events/095): 1 cases ## Aircraft models (registry) - [Fairchild SA227-AC](https://openairdocs.org/model/fairchild-sa227-ac): 1 cases - [Cessna 210M](https://openairdocs.org/model/cessna-210m): 1 cases - [Cessna 210K](https://openairdocs.org/model/cessna-210k): 1 cases - [Cessna 210](https://openairdocs.org/model/cessna-210): 1 cases - [Bombardier CL-600-2B19](https://openairdocs.org/model/bombardier-cl-600-2b19): 1 cases - [Bell 230](https://openairdocs.org/model/bell-230): 1 cases ## Other findings in the same cases - [Hydraulic fluid](https://openairdocs.org/ntsb-findings/01071015) (Aircraft): 3 cases - [Gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230) (Aircraft): 3 cases - [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 1 cases - [Policy/procedure, general](https://openairdocs.org/ntsb-findings/04021000) (Organizational issues): 1 cases - [Maintenance, general](https://openairdocs.org/ntsb-findings/02062000) (Personnel issues): 1 cases - [Fasteners](https://openairdocs.org/ntsb-findings/01071430) (Aircraft): 1 cases - [Fluids, general](https://openairdocs.org/ntsb-findings/01071000) (Aircraft): 1 cases - [Main landing gear](https://openairdocs.org/ntsb-findings/01023210) (Aircraft): 1 cases - [Hyd pwr sys wiring](https://openairdocs.org/ntsb-findings/01022997) (Aircraft): 1 cases ## Newest cases - [NTSB ERA22LA005](https://openairdocs.org/ntsb/ERA22LA005), Oct 5, 2021: Cessna 210 (N6318B), Columbia, SC, substantial damage. Probable cause: A failure of the landing gear hydraulic power pack for reasons that could not be determined. - [NTSB WPR20LA288](https://openairdocs.org/ntsb/WPR20LA288), Aug 26, 2020: Cessna 210 (N9540T), Chino, CA, substantial damage. Probable cause: The failure of the engine-driven hydraulic pump, which resulted in the main landing gear not fully extending and locking into place during landing. Contributing to the accident was the failure of the… - [NTSB ENG20LA031](https://openairdocs.org/ntsb/ENG20LA031), May 3, 2020: Airbus Helicopters AS350 (N1WT), Clewiston, FL, incident, no damage. Probable cause: Seizure of the hydraulic pump pulley bearing due to its improper installation by the manufacturer, leading to a failure of the hydraulic pump belt and the resultant partial loss of hydraulic… - [NTSB ANC18LA043](https://openairdocs.org/ntsb/ANC18LA043), Jun 1, 2018: Cessna 210 (N9410M), Ramona, CA, substantial damage. Probable cause: The failure of the engine-driven hydraulic pump due to the installation of improper cap screws, which resulted in a gap in the pump housing, a subsequent hydraulic leak, and the landing gear… - [NTSB CEN13IA059](https://openairdocs.org/ntsb/CEN13IA059), Nov 10, 2012: Fairchild SA227-AC (N619BA), Minneapolis, MN, incident, minor damage. Probable cause: Loose electrical connections to the hydraulic system and anomalies in the hydraulic shuttle valve and power pack, which resulted in an uncommanded gear unlock and collapse of the left main landing… - [NTSB CEN11IA379](https://openairdocs.org/ntsb/CEN11IA379), Jun 7, 2011: Bombardier CL-600-2B19 (N866AS), Milwaukee, WI, incident, minor damage. Probable cause: The failure of the right main landing gear (MLG) to extend normally, which resulted from the combination of a slightly worn uplock pin, the operation of the hydraulic pumps below their specified… - [NTSB CEN09IA618](https://openairdocs.org/ntsb/CEN09IA618), Jul 1, 2009: Bell 230 (N880SF), Peoria, IL, incident, no damage. Probable cause: The loss of the number one hydraulic system fluid and hydraulic pressure during cruise due to the failure of the bolts that secure the hydraulic pump's cover. 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.