# Hydraulic power system, general - 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) › Hydraulic power system, general - NTSB code: 01022900 - Cases: 22 - In the probable cause: 20 - Fatal cases: 4 - All cases: https://openairdocs.org/ntsb-findings/01022900/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022900/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01022900 ## Cases per year (in the probable cause / all) - 2008: 4 / 4 - 2009: 2 / 4 - 2010: 1 / 1 - 2011: 3 / 3 - 2013: 1 / 1 - 2014: 1 / 1 - 2015: 3 / 3 - 2016: 1 / 1 - 2018: 1 / 1 - 2021: 2 / 2 - 2022: 1 / 1 ## Defining events in these cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 7 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 6 cases - [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 3 cases - [Electrical system malf/failure](https://openairdocs.org/ntsb-events/332): 1 cases - [Runway excursion](https://openairdocs.org/ntsb-events/300): 1 cases - [Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241): 1 cases - [Low altitude operation/event](https://openairdocs.org/ntsb-events/220): 1 cases - [Ground collision](https://openairdocs.org/ntsb-events/200): 1 cases - [Landing gear not configured](https://openairdocs.org/ntsb-events/095): 1 cases ## Aircraft models (registry) - [Eurocopter AS 350 B3](https://openairdocs.org/model/eurocopter-as-350-b3): 3 cases - [Eurocopter AS 350 B2](https://openairdocs.org/model/eurocopter-as-350-b2): 1 cases - [Aerospatiale AS350 B2 ECUREUIL](https://openairdocs.org/model/aerospatiale-as350-b2-ecureuil): 1 cases - [Piper PA 46-350P](https://openairdocs.org/model/piper-pa-46-350p): 1 cases - [Piper PA-46-310P](https://openairdocs.org/model/piper-pa-46-310p): 1 cases - [Piper PA-32R-300](https://openairdocs.org/model/piper-pa-32r-300): 1 cases - [North American T-28B](https://openairdocs.org/model/north-american-t-28b): 1 cases - [Gulfstream Aerospace GV-SP (G550)](https://openairdocs.org/model/gulfstream-aerospace-gv-sp-g550): 1 cases - [Cessna 177RG](https://openairdocs.org/model/cessna-177rg): 1 cases - [Cessna 210A](https://openairdocs.org/model/cessna-210a): 1 cases ## Other findings in the same cases - [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 4 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 4 cases - [Lack of action](https://openairdocs.org/ntsb-findings/02041030) (Personnel issues): 4 cases - [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 3 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 3 cases - [Incorrect action performance](https://openairdocs.org/ntsb-findings/02041015) (Personnel issues): 3 cases - [Main landing gear](https://openairdocs.org/ntsb-findings/01023210) (Aircraft): 3 cases - [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 2 cases - [Forgotten action/omission](https://openairdocs.org/ntsb-findings/02041035) (Personnel issues): 2 cases - [Delayed action](https://openairdocs.org/ntsb-findings/02041025) (Personnel issues): 2 cases ## Newest cases - [NTSB ERA22LA148](https://openairdocs.org/ntsb/ERA22LA148), Mar 7, 2022: Cessna 525 (N22AU), Middle River, MD, substantial damage. Probable cause: And undetermined failure of the brake system. Contributing to the accident was the failure of the pilots to locate and operate the emergency brake control, which resulted in a runway excursion and… - [NTSB WPR21LA323](https://openairdocs.org/ntsb/WPR21LA323), Aug 15, 2021: Cessna 177RG (N8029G), Albuquerque, NM, substantial damage. Probable cause: The failure of the nose gear hydraulic flex line, which resulted in a loss of hydraulic fluid which prevented the main landing gear from fully extending and locking into place during landing. - [NTSB CEN21LA216](https://openairdocs.org/ntsb/CEN21LA216), May 12, 2021: Aerospatiale AS350 B2 Ecureuil (N841BP), Yukon, OK, destroyed. Probable cause: The pilot receiving instruction’s untimely and unidentified inadvertent activation of the hydraulic cut-off switch, which turned off the hydraulic system while the helicopter was at slow airspeed… - [NTSB CEN18LA349](https://openairdocs.org/ntsb/CEN18LA349), Aug 23, 2018: North American T-28B (N215SF), Minneapolis, MN, destroyed. Probable cause: The fire during approach for reasons that could not be determined based on the available evidence, which resulted in impact with terrain during approach for a precautionary landing. - [NTSB ANC17LA014](https://openairdocs.org/ntsb/ANC17LA014), Nov 21, 2016: Piper PA 32R-300 (N4352F), McGrath, AK, minor damage. Probable cause: The failure of the nose landing gear to extend and lock due to the failure of the alternator and reduced battery power due to the cold ambient temperature, which prohibited the electrically-driven… - [NTSB WPR16FA040](https://openairdocs.org/ntsb/WPR16FA040), Dec 16, 2015: Airbus Helicopters AS350 (N74317), Superior, AZ, substantial damage, 2 fatal. Probable cause: The pilot's loss of helicopter control in mountainous terrain as the result of operating the helicopter outside the performance envelope of its hydraulic system and encountering the servo… - [NTSB WPR15LA234](https://openairdocs.org/ntsb/WPR15LA234), Jul 26, 2015: Cessna 180J (N52095), Dixie, ID, substantial damage. Probable cause: The failure of the right brake hydraulic line during taxi due to fatigue, which caused a loss of hydraulic fluid and rendered the brake inoperative. - [NTSB CEN15MA290](https://openairdocs.org/ntsb/CEN15MA290), Jul 3, 2015: Airbus Helicopters AS350B3E (N390LG), Frisco, CO, destroyed, 1 fatal. Probable cause: Airbus Helicopters' dual-hydraulic AS350 B3e helicopter's (1) preflight hydraulic check, which depleted hydraulic pressure in the tail rotor hydraulic circuit, and (2) lack of salient alerting to the… - [NTSB CEN14IA329](https://openairdocs.org/ntsb/CEN14IA329), Jun 26, 2014: Eurocopter AS 350 B3 (N808LF), Temple, TX, incident, minor damage. Probable cause: The pilot’s failure to reposition the yaw servo hydraulic switch to the “on” position during the pretakeoff hydraulic system check, which resulted in a complete lack of hydraulic boost to the tail… - [NTSB DCA13MA081](https://openairdocs.org/ntsb/DCA13MA081), Apr 29, 2013: Boeing 747-400 BCF (N949CA), Bagram, Afghanistan, destroyed, 7 fatal. Probable cause: National Airlines' inadequate procedures for restraining special cargo loads, which resulted in the loadmaster's improper restraint of the cargo, which moved aft and damaged hydraulic systems Nos. 1… 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.