# NTSB investigations: Hydraulic power system, general 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 ERA22LA148](https://openairdocs.org/ntsb/ERA22LA148.md): Cessna 525 · Middle River, MD · Accident · No injuries · Class 3 · Limited · Final report · Mar 7, 2022 · N22AU · Substantial damage > 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 collision with terrain and an object. - [NTSB WPR21LA323](https://openairdocs.org/ntsb/WPR21LA323.md): Cessna 177RG · Albuquerque, NM · Accident · No injuries · Class 3 · Limited · Final report · Aug 15, 2021 · N8029G · Substantial damage > 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.md): Aerospatiale AS350 B2 Ecureuil · Yukon, OK · Accident · No injuries · Class 3 · Limited · Final report · May 12, 2021 · N841BP · Destroyed > 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 followed by a rapid power increase, which resulted in a loss of… - [NTSB CEN18LA349](https://openairdocs.org/ntsb/CEN18LA349.md): North American T-28B · Minneapolis, MN · Accident · Serious injuries · Limited investigation · Final report · Aug 23, 2018 · N215SF · Destroyed > 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.md): Piper PA 32R-300 · McGrath, AK · Accident · Serious injuries · Limited investigation · Final report · Nov 21, 2016 · N4352F · Minor damage > 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 hydraulic pump from supplying adequate hydraulic pressure to… - [NTSB WPR16FA040](https://openairdocs.org/ntsb/WPR16FA040.md): Airbus Helicopters AS350 · Superior, AZ · Accident · 2 fatal · Field investigation · Final report · Dec 16, 2015 · N74317 · Substantial damage > 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 transparency phenomenon. Contributing to the accident was the pilot's… - [NTSB WPR15LA234](https://openairdocs.org/ntsb/WPR15LA234.md): Cessna 180J · Dixie, ID · Accident · No injuries · Limited investigation · Final report · Jul 26, 2015 · N52095 · Substantial damage > 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.md): Airbus Helicopters AS350B3E · Frisco, CO · Accident · 1 fatal · Class 1 · Major · Final report · Jul 3, 2015 · N390LG · Destroyed > 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 pilot that hydraulic pressure was not restored before… - [NTSB CEN14IA329](https://openairdocs.org/ntsb/CEN14IA329.md): Eurocopter AS 350 B3 · Temple, TX · Incident · No injuries · Incident investigation · Final report · Jun 26, 2014 · N808LF · Minor damage > 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 rotor system and increased the load required to move the… - [NTSB DCA13MA081](https://openairdocs.org/ntsb/DCA13MA081.md): Boeing 747-400 BCF · Bagram, Afghanistan · Accident · 7 fatal · Class 1 · Major · Final report · Apr 29, 2013 · N949CA · Destroyed > 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 and 2 and horizontal stabilizer drive mechanism components,… - [NTSB WPR11GA144](https://openairdocs.org/ntsb/WPR11GA144.md): Eurocopter AS 350 B2 · Riverside, CA · Accident · Minor injuries · Final report · Feb 24, 2011 · N965SD · Substantial damage > The failure of both pilots to follow proper procedures during a simulated hydraulic emergency that resulted in a loss of helicopter control. Contributing to the accident was the flight instructor’s delayed remedial action. - [NTSB CEN11FA193](https://openairdocs.org/ntsb/CEN11FA193.md): Gulfstream Aerospace GV-SP · Appleton, WI · Accident · No injuries · Field investigation · Final report · Feb 14, 2011 · N535GA · Substantial damage > The pilot flying's (PF) decision to land on a shorter-than-recommended runway with a known left hydraulic system failure rather than go around as suggested by the pilot-not-flying, his failure to immediately apply emergency brakes following the detection of… - [NTSB ERA11FA133](https://openairdocs.org/ntsb/ERA11FA133.md): Potez-Air Fouga CM 170 Magister · Kissimmee, FL · Accident · 2 fatal · Field investigation · Final report · Feb 2, 2011 · N415FM · Substantial damage > The pilot/mechanic's improper decision to continue a tight-turning landing pattern after a loss of hydraulic pressure, and his subsequent failure to maintain adequate airspeed during that pattern, which resulted in an accelerated maneuver stall. Contributing… - [NTSB CEN10LA572](https://openairdocs.org/ntsb/CEN10LA572.md): Cessna 172RG · Tulsa, OK · Accident · Serious injuries · Limited investigation · Final report · Sep 28, 2010 · N5145U · Destroyed > A shorted terminal lug on the landing gear hydraulic pump which resulted in a cabin fire. Contributing to the accident was the lack of clear installation procedures for the hydraulic pump. - [NTSB ERA09TA440](https://openairdocs.org/ntsb/ERA09TA440.md): Eurocopter AS 350B3 · Jacksonville, FL · Accident · Minor injuries · Final report · Aug 4, 2009 · N186AE · Substantial damage > The flight instructor's improper decision to attempt hover flight without hydraulic power and his subsequent loss of control. - [NTSB WPR09LA361](https://openairdocs.org/ntsb/WPR09LA361.md): Piper PA-46-350P · Redmond, OR · Accident · No injuries · Limited investigation · Final report · Jul 21, 2009 · N117KR · Substantial damage > An undetermined hydraulic system malfunction in the engine compartment during descent from cruise flight which resulted in an in-flight fire. - [NTSB WPR09LA341](https://openairdocs.org/ntsb/WPR09LA341.md): Piper PA-46-310P · Westley, CA · Accident · No injuries · Limited investigation · Final report · Jul 14, 2009 · N330HT · Substantial damage > The failure of the landing gear hydraulic line socket, which resulted in a hydraulic leak and in-flight fire. Contributing to the accident was the failure of the owner and/or maintenance facility to comply with the maintenance manual hose replacement schedule. - [NTSB WPR09LA100](https://openairdocs.org/ntsb/WPR09LA100.md): Cessna 210A · Henderson, NV · Accident · No injuries · Limited investigation · Final report · Jan 27, 2009 · N210TF · Substantial damage > An undetermined failure of the hydraulic power pack to fully extend the main landing gear through both the normal and emergency systems. - [NTSB MIA08LA149](https://openairdocs.org/ntsb/MIA08LA149.md): Aero Commander 500-B · Charlotte Amali · Accident · No injuries · Limited investigation · Final report · Jun 1, 2008 · N411FS · Substantial damage > The failure of maintenance personnel to identify inadequate clamping of the aluminum line during inspection, and the undetected fatigue cracking of the line which resulted in the loss of hydraulic fluid. - [NTSB ENG08IA022](https://openairdocs.org/ntsb/ENG08IA022.md): Boeing 747 · Newark, NJ · Incident · No injuries · Incident investigation · Final report · Apr 20, 2008 · N704CK · Minor damage > An engine fire in the No. 3 engine due to the failure of, and subsequent flammable fluid leak from, one of three fuel or hydraulic lines located in the engine's accessory raceway that ignited when the fluid came in contact with the hot engine cases.… - [NTSB NYC08LA091](https://openairdocs.org/ntsb/NYC08LA091.md): North American Rockwell NA-265-80 · Ft. Lauderdale, FL · Accident · Minor injuries · Limited investigation · Final report · Feb 1, 2008 · N3RP · Substantial damage > The depletion of pressure in the normal hydraulic system for an undetermined reason, and the pilots' failure to properly operate the emergency braking system. Contributing to the accident was an inoperative hydraulic system aural warning. - [NTSB CHI08IA065](https://openairdocs.org/ntsb/CHI08IA065.md): Boeing 737-2H4 · Lincoln, NE · Incident · No injuries · Incident investigation · Final report · Jan 8, 2008 · N733TW · No damage > The improper installation of the swivel valve fittings by the operator's mechanic leading to the total loss of both hydraulic systems. Contributing to the incident were the swivel valves leaking and the total failure of the hydraulic system. ## 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", '01022900')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb-findings/01022900/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.