NTSB investigations: Lycoming VO-435 series
629 cases on aircraft whose registry engine model is Lycoming VO-435 series. Aircraft are matched to the registry by N-number and event date, checked against the reported serial number, make and model, so older matches can be wrong.
Cases, newest first
Query with SQL
duckdb -csv -c "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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525'))
ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('41525'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESCRun it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
NTSB LAX98LA309Accident · No injuriesLimited investigationFinal reportTexas Helicopter OH-13H · Gilroy, CAThe pilot's loss of control for undetermined reasons.NTSB CHI98LA292Accident · No injuriesLimited investigationFinal reportBell M74L · Grand Forks, NDThe worn rotor clutch shoes, and subsequent loss of main rotor rpm.NTSB LAX98LA225Accident · Minor injuriesLimited investigationFinal reportBell 47G-5 · Salinas, CAThe failure of the pilot to maintain clearance with the telephone lines.NTSB MIA98LA154Accident · Minor injuriesLimited investigationFinal reportBell 47G-2 · Fort Walton Bch, FLThe loss of engine power for undetermined reasons.NTSB NYC98LA023Accident · No injuriesLimited investigationFinal reportHiller UH-12D · Farmingdale, NJThe certificated flight instructor's inadequate supervision and failure to maintain directional control.NTSB LAX98LA001Accident · No injuriesLimited investigationFinal reportBell 47G-2 · Burbank, CAA loss of engine power for undetermined reasons.NTSB CHI97LA306Accident · Serious injuriesLimited investigationFinal reportBell 47 · Pipestone, MNthe fracture of the pitch control rod assembly.NTSB FTW97LA264Accident · Serious injuriesLimited investigationFinal reportBell 47G-3B-1 · Crossett, ARfailure of maintenance personnel to perform an adequate inspection of the fuselage center frame and detect a fatigue fracture of a longeron tube on the upper left side of the center frame, which resulted in a disconnect of the tail rotor drive shaft from the…NTSB LAX97LA006Accident · No injuriesLimited investigationFinal reportBell 47G-5A · King City, CAthe pilot's failure to maintain adequate rotor rpm during the takeoff initial climb.NTSB CHI97LA004Accident · No injuriesLimited investigationFinal reportBell 47G-5 · Nunda, SDfailure of maintenance personnel to properly torque the six accessory drive bolts, which resulted in fatigue failure of the undertorqued bolts.NTSB LAX96LA326Accident · No injuriesLimited investigationFinal reportBell 47-G5 · Riverside, CAThe pilot's inaccurate perception of altitude which resulted in an improper flare and subsequent hard landing, and non use of the landing light.NTSB LAX96LA287Accident · No injuriesLimited investigationFinal reportBell 47-G5 · Lost Hills, CAimproper installation of the carburetor air box.NTSB FTW96LA229Accident · No injuriesLimited investigationFinal reportBell 47J · Lakeway, TXThe pilot's failure to maintain a proper descent rate prior to landing.NTSB FTW96LA121Accident · No injuriesLimited investigationFinal reportHiller UH-12D · Carrizo Springs, TXa loss of engine power for undetermined reasons, and the pilot's improper touchdown.NTSB LAX96LA111Accident · 1 fatalLimited investigationFinal reportBell 47G-2A1 · Honiara, Solomon Islandsthe pilot and the ship crew's failure to assure the tie down strap was removed prior to liftoff.NTSB FTW96LA008Accident · Minor injuriesLimited investigationFinal reportBell 47-G2 · Freer, TXthe pilot's failure to maintain clearance from the power lines due to his improper takeoff technique. A factor was the helicopter induced blowing dust which impaired the pilot's visibility.NTSB SEA95LA227Accident · No injuriesLimited investigationFinal reportTexas Helicopter OH-13E · Yakima, WAFatigue failure of the bolt attaching the scissor arm assembly to the pitch control support assembly. The failure of the bolt led to a loss of collective pitch control and reduced rotor RPM.NTSB ATL95LA145Accident · No injuriesLimited investigationFinal reportBell 47G2 · Montrose, GAThe pilot's inadequate preflight planning and visual lookout.NTSB FTW95LA310Accident · Serious injuriesLimited investigationFinal reportWilliams Bell OH13H/Tomcat MK5A · Alicia, ARThe pilot's failure to remove the refueling hose. A factor was that he diverted his attention from the refueling operation.NTSB LAX95LA216Accident · No injuriesLimited investigationFinal reportBell 47-G5 · Coalinga, CAclutch slippage for undetermined reasons. A factor in the accident was the helicopter's low above ground altitude, which limited the pilot's time and ability to recover main rotor rpm.NTSB LAX95LA213Accident · No injuriesLimited investigationFinal reportBell 47-G2A · Bakersfield, CAthe pilot's failure to maintain adequate lateral clearance from the irrigation standpipe while applying chemicals to a field.NTSB FTW95LA239Accident · No injuriesLimited investigationFinal reportBell 47G-5 · Falfurrias, TXInadvertent installation of an unapproved part (tail rotor gear/drive assembly), that became excessively worn since it did not conform to the manufacturer's specification, resulting in failure of the associated tail rotor bearing (also an unapproved part),…NTSB NYC95LA100Accident · Minor injuriesLimited investigationFinal reportBell 47G-5A · Middleboro, MAthe pilot's failure to maintain airspeed during a low altitude aerial application turn, which resulted in inadvertent settling with power and the subsequent collision with the terrain.NTSB LAX95LA138Accident · No injuriesLimited investigationFinal reportBell 47 · Harmon Fieldan engine failure due to oil exhaustion from a missing oil pressure relief valve as the result of an improper maintenance inspection.NTSB CHI95LA003Accident · Minor injuriesLimited investigationFinal reportBell 47G2 · Decatur, ILthe failure of the roller springs in the freewheeling unit of the transmission which caused the unit to disengage.NTSB LAX94LA386Accident · 2 fatalLimited investigationFinal reportBell 47G-5 · Pacific Ocean (Pacific Ocean)an in-flight collision with the water for undetermined reasons.NTSB LAX94LA303Accident · No injuriesLimited investigationFinal reportBell 47G-2A · Scottsdale, AZThe pilot's failure to refuel appropriately, the altitude and airspeed at the time the engine stoppage occurred were factors in the accident.NTSB CHI94T#A02Accident · No injuriesClass 3Final reportContinental Copters MK 5 Tomcat · Minot, NDNTSB NYC94LA110Accident · Minor injuriesLimited investigationFinal reportBell 47-G5 · Wareham, MAThe pilot's inadequate inflight planning which resulted in fuel exhaustion and the loss of engine power.NTSB FTW94FA158Accident · 1 fatalField investigationFinal reportBell 47G-2 · Tulsa, OKIn flight loss of control due to the pilot's improper use of the cyclic and collective controls when he maneuvered abruptly to avoid colliding with a flock of birds. Factors were the birds and the inflight separation of the left synchronized elevator.NTSB LAX94LA199Accident · 1 fatalLimited investigationFinal reportContinental Copters Tomcat MK5A · Brawley, CAFailure of the pilot to maintain sufficient altitude, while maneuvering to land after completing aerial application. Factors related to the accident were: darkness and the lack of visual cues for the pilot to detect the obstruction (power line).NTSB CHI94FA330Accident · 1 fatalField investigationFinal reportBell 47G-5A · Wisconsin Rpds, WIUndetermined.NTSB CHI94LA133Accident · No injuriesLimited investigationFinal reportBell 47-62 · Aurora, MOThe dual students inadequate flare and the pilot in command's (flight instructor) delayed remedial action.NTSB NYC94LA050Accident · Serious injuriesLimited investigationFinal reportBell 47G-5 · Plymouth, MAThe pilot's failure to maintain adequate clearance of the fuel truck from the aircraft, which resulted in the main rotor striking the fuel hose and truck during refueling operation. A factor was the pilot's failure to follow company policy pertaining to the…NTSB SEA94LA064Accident · Minor injuriesLimited investigationFinal reportHiller-Soloy H-23D · Seaside, ORThe pilot's improper use of flight controls resulting in settling with power.NTSB ATL94LA009Accident · No injuriesLimited investigationFinal reportBell 47G2 · Billingsley, ALThe pilot's improper vertical liftoff which resulted in dynamic roll-over and the main rotor's impact with the ground.NTSB CHI93DEP05Accident · Minor injuriesFinal reportBell 47-G5 · Fulton, WIthe failure (fracture) of the number one cylinder intake valve retainer (keeper).NTSB CHI93LA320Accident · Minor injuriesLimited investigationFinal reportBell 47-G5 · Schaumburg, ILthe pilot's improper autorotation techniques.NTSB DEN93LA091Accident · No injuriesLimited investigationFinal reportContinental Copters Tomcat MK5A · Duson, LAFailure of the transmission mast bearing, resulting in oil contamination and subsequent blockage of the internal oil ports and passages. Factors were: total loss of collective control and partial loss of cyclic control.NTSB FTW93LA178Accident · No injuriesLimited investigationFinal reportBell-Transworld 47G-2 · Wynne, ARPartial power loss due to the failure of one magneto. A factor was the lack of suitable terrain for the forced landing.NTSB CHI93LA179Accident · Minor injuriesLimited investigationFinal reportBell 47 · Berlin, WIThe pilot-in-command's failure to see the obstruction.NTSB LAX93LA157Accident · Minor injuriesLimited investigationFinal reportBell 47G5 · Greenfield, CAThe pilot's failure to maintain an adequate clearance from the power lines while performing an aerial application run.NTSB MIA93LA076Accident · Minor injuriesLimited investigationFinal reportHuddleston-Bell 47G2 · Rio Grande, PRPoor in-flight planning by the pilot-in-command. Contributing to the accident was the flight's lack of total experience.NTSB MIA93LA027Accident · Minor injuriesLimited investigationFinal reportBell 47-G5A · Belle Glade, FLThe improper in flight decision of the pilot in command to attempt an agricultural turn with insufficient altitude to accomplish the maneuver. Contributing to the accident was the pilot's overconfidence in his abilities.NTSB LAX92LA378Accident · No injuriesLimited investigationFinal reportTexas Helicopter OH-13E/M74 · Chandler, AZThe pilot's misjudging the performance and weight and balance data of the helicopter prior to departure. Contributing to the accident was a failure of the pilot to jettison the chemical load.NTSB FTW92DPG15Accident · No injuriesFinal reportBell-Transworld 47G-2 · Birdeye, ARFuel contamination. A factor was the high density altitude.NTSB ATL92LA160Accident · Serious injuriesLimited investigationFinal reportBell 47G-2 · Slocomb, ALA hard landing due to a power loss from fuel exhaustion. A factor in the accident was the lack of sustable terrain for the landing.NTSB LAX92LA278Accident · Minor injuriesLimited investigationFinal reportBell 47G5 · Mesa, AZA partial loss of engine power due to unknown reason (s). Factors in this accident were 1) low altitude when the partial loss of power occurred 2) low rotor RPM as a result of the loss of power, and 3) the pilot not being able to take remedial action due to…NTSB MIA92T#A01Accident · No injuriesClass 3Final reportContinental Copters Tomcat MK6B · Punta Gorda, FLNTSB LAX92LA262Accident · Serious injuriesLimited investigationFinal reportBell 47-G5A · Pago Pago (Pacific Ocean)The pilot's inadequate preflight inspection in failing to ensure that all skid tiedowns were removed prior to the attempted takeoff.