Allison 250-C20 series
NTSB investigations · 372
Matched to the registry by N-number and event date, 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_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c.\"mKey\" = a.case_mkey
WHERE a.engine_model_code IN ('03020')
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_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = a.case_mkey
WHERE a.engine_model_code IN ('03020')
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 WPR26LA347Accident · No injuriesClass 3 · LimitedPreliminary reportBell 206B-III · Creswell, NCOn September 18, 2026, at 1018 eastern daylight time, a Bell 206B-III, N50141, was substantially damaged when it was involved in an accident near Creswell, North Carolina. The pilot was not injured. The helicopter was being operated as a Title 14 Code of…NTSB WPR26LA199Accident · Minor injuriesClass 4 · LimitedFinal reportBell 206-L4 · Cedar City, UTThe flight instructor's failure to maintain helicopter control while manipulating the engine governor reference rpm adjustment during hover operations, which resulted in a loss of control and impact with the ground.NTSB CEN24LA377Accident · No injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Helicopter 369E · Manvel, TXThe pilot’s improper recovery from a practice autorotation which resulted in a hard landing. Contributing to the accident was the instructor’s inadequate supervision of the pilot receiving instruction.NTSB WPR24LA319Accident · No injuriesClass 3 · LimitedFinal reportBell 206L · Fern Prairie, WAAn aeroelastic interaction between the helicopter’s main rotor blades and nodal beam system, which resulted in oscillations that exceeded the design limits of the tailboom. Contributing to the accident was the failure of the main rotor blade manufacturer to…NTSB ANC24FA089Accident · 1 fatalClass 3 · FieldFinal reportBell 206B · King Salmon, AKThe pilot’s decision to initiate the visual flight into instrument meteorological conditions, which resulted in his spatial disorientation, failure to maintain helicopter control and subsequent impact with water.NTSB ERA24LA215Accident · No injuriesClass 4 · LimitedFinal reportHughes 369 · Crestview, FLThe pilot’s improper flare, which resulted in a hard landing and the main rotor blades contacting the tail boom.NTSB ANC24LA012Accident · No injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Helicopter 369E · Waialua, HIThe pilot's inability to maintain directional control after a skid got caught on a fence while he was maneuvering the helicopter for takeoff, which resulted in a dynamic roll-over.NTSB CEN23LA404Accident · No injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Helicopter 369E · Arcola, TXThe instructor’s failure to re-apply engine power during a power recovery after a practice autorotation which resulted in a hard landing.NTSB WPR23LA278Accident · No injuriesClass 3 · LimitedFinal reportAerospatiale AS-355E Twin Star · Farmington, UTThe premature failure of one of the No. 2 engine compressor bleed valve, which resulted in a partial loss of power to that engine.NTSB CEN23LA279Accident · No injuriesClass 4 · LimitedFinal reportBell 206B · Chapman, KSThe pilot’s failure to maintain clearance from the power line during an agricultural application pass.NTSB WPR23LA004Accident · Serious injuriesClass 3 · LimitedFinal reportBell 206B · Fresno, CAThe disbond of a tail rotor drive shaft splined adapter, which resulted in a loss of tail rotor drive and a subsequent hard landing.NTSB CEN22LA305Accident · No injuriesClass 4 · LimitedFinal reportBell 206B · East Troy, WIThe pilot’s improper fuel management that resulted in fuel exhaustion and a loss of engine power.NTSB WPR22LA236Accident · No injuriesClass 3 · LimitedFinal reportBell 206B · Merced, CAThe in-flight failure of the engine-to-transmission drive shaft due to a fatigue fracture of one of the KAflex flex frames caused by a loose bolt, which resulted in a total loss of power to the transmission and a subsequent hard landing.NTSB ERA22LA206Accident · Minor injuriesClass 4 · LimitedFinal reportBell 206 · Lake Apopka, FLA collision with water following a loss of visual reference to the water surface due to sun glare.NTSB CEN22LA146Accident · Minor injuriesClass 3 · LimitedFinal reportHughes 369 · Adair, IAThe mechanic’s failure to properly torque a fuel control unit B-nut, which resulted in a partial loss of engine power, an attempted autorotation, and an impact with terrain.NTSB WPR22FA101Accident · 1 fatalClass 3 · FieldFinal reportMcdonnell Douglas 500N · Newport Beach, CAThe helicopter’s encounter with unanticipated right yaw during a low-altitude, low-airspeed, tight-radius orbit. Contributing to the accident was the pilot’s distraction during the orbit, which resulted in the loss of control, his fatigue due to his early…NTSB ERA22LA117Accident · No injuriesClass 3 · LimitedFinal reportHughes 369D · Bel Air, MDA loss of engine power due to bearing failures in the turbine section resulting from a fatigue fracture of the oil supply line that fed oil to the Nos. 6 and 7 bearings. The oil line failure led to rapid deterioration of the bearings from oil starvation.…NTSB CEN22FA086Accident · 2 fatalClass 3 · FieldFinal reportBell 206B · Livingston, TXThe pilot exceeding the yaw control capability of the helicopter for the flight conditions, resulting in a non-mechanical loss of tail rotor effectiveness.NTSB CEN21LA356Accident · Serious injuriesClass 4 · LimitedFinal reportBell 206 · Corydon, INThe pilot’s failure to see and avoid power lines.NTSB ERA21LA269Accident · 1 fatalClass 3 · LimitedFinal reportGarlick Helicopters OH-58A+ · Alpine, ALThe pilot’s failure to maintain clearance from powerlines during a low-level aerial application flight, resulting in main rotor blade impact with a fiber-optic cable, a loss of control, and the helicopter’s subsequent impact with terrain.NTSB ERA21LA262Accident · Serious injuriesClass 3 · LimitedFinal reportMcdonnell Douglas Helicopter 369E · Swan Lake, NYThe pilot's failure to maintain adequate clearance from the power transmission tower structure during powerline maintenance work, which resulted in the helicopter's main rotor striking the lifeline support bracket for the tower catwalk and the subsequent loss…NTSB ERA21FA130Accident · 4 fatalClass 3 · FieldFinal reportBell 206 · St Thomas, CBA total loss of engine power due to fatigue failure of two of the stage 3 compressor blades. Contributing to the failure of the compressor blades was the failure of maintenance personnel to inspect the compressor at the recommended interval for operation in…NTSB ERA21LA126Accident · No injuriesClass 3 · LimitedFinal reportBell 206 · Pahokee, FLA loss of main rotor rpm for reasons that could not be determined, which resulted in an autorotation and a subsequent hard landing and rollover.NTSB ERA21LA028Accident · Minor injuriesClass 3 · LimitedFinal reportBell 206 · Point Lookout, NYThe pilot’s decision to depart on a visual flight rules flight, and to continue that flight into forecasted and deteriorating instrument meteorological conditions (IMC) in a helicopter that was not equipped for flight in IMC, which resulted in the pilot’s…NTSB CEN20LA273Accident · Serious injuriesClass 3 · LimitedFinal reportAerospatiale AS355 · Rifle, COA loss of tail rotor effectiveness, the pilot’s subsequent loss of helicopter control, and collision with terrain.NTSB WPR20CA162Accident · No injuriesClass 4 · Data collectionFinal reportBell 206 · Elko, NVThe pilot's failure to maintain helicopter control in gusting wind that resulted in a loss in altitude and subsequent collision with a fence.NTSB ERA20LA160Accident · No injuriesClass 3 · LimitedFinal reportHughes 369 · Pylesville, MDThe loss of engine power due to fuel starvation as a result of unporting of the fuel tank supply pickup while the helicopter was maneuvered to move a conductor wire. Contributing to the accident was the helicopter’s inappropriate configuration for the type of…NTSB CEN20LA073Accident · No injuriesClass 3 · LimitedFinal reportHiller UH 12E · Dinosaur, COFailure of a S4 compressor blade due to a fatigue crack that likely initiated at a corrosion pit. Contributing to the accident was maintenance personnel’s failure to detect the corrosion pits during maintenance.NTSB WPR19LA135Accident · Serious injuriesClass 3 · LimitedFinal reportBell 206 · Oxnard, CAThe pilot’s inability to maintain control of the helicopter while maneuvering at a low altitude due to reasons that could not be determined based on available evidence.NTSB WPR19LA087Accident · Serious injuriesClass 3 · LimitedFinal reportMD Helicopter 369 · Kukuihaele, HIThe partial loss of engine power due to corrosion in the engine bleed valve due to wash solution intrusion. Contributing to the accident was the installation of a bushing manufactured to incorrect dimensions in the bleed valve, and the uneven terrain at the…NTSB CEN19FA020Accident · 1 fatalClass 2 · FieldFinal reportHughes 369 · McDougal, ARThe pilot's failure to maintain the helicopter's clearance from the powerline structure while hovering in gusty wind conditions, which resulted in an inadvertent collision with the structure and an uncontrolled descent into terrain.NTSB ERA19FA035Accident · 2 fatalField investigationFinal reportAerospatiale AS 355F2 · Beekmantown, NYThe pilot's failure to keep the helicopter clear of a utility pole while hovering with a tailwind, which resulted in a dynamic rollover into active power lines.NTSB CEN18LA365Accident · Serious injuriesLimited investigationFinal reportMD Helicopters MD-369 · Orchard Lake, MIThe pilot's failure to maintain helicopter control and terrain clearance while in a hover after performing an evasive maneuver to avoid wildlife.NTSB GAA18CA512Accident · No injuriesClass 4 · Data collectionFinal reportBell 206 · Battle Mountain, NVThe pilot's failure to maintain the proper altitude and airspeed while flying in a canyon in gusting wind conditions.NTSB WPR18LA226Accident · Serious injuriesClass 3 · LimitedFinal reportHughes 369 · Riverside, CAThe instructor’s delayed remedial action to an excessive descent rate during a simulated autorotation, which resulted in a hard landing.NTSB ERA18LA183Accident · 1 fatalLimited investigationFinal reportBell 206 · Rio Grande, PRA total loss of engine power due to oil exhaustion, which resulted in an uncontrolled descent and hard landing.NTSB WPR18LA164Accident · Minor injuriesClass 3 · LimitedFinal reportBell 206 · Sanders, KYA partial loss of engine power for undetermined reasons, and a loss of main rotor rpm during the subsequent autorotation, which resulted in a hard landing.NTSB GAA18CA117Accident · No injuriesData collectionFinal reportHughes Helicopters 369 · Wrightwood, CAThe pilot’s high altitude, high gross weight landing with insufficient tail rotor thrust resulting in a loss of tail rotor effectiveness.NTSB WPR18FA074Accident · 1 fatalField investigationFinal reportHughes 369D · Pomeroy, WAA loss of control following the gunner's failure to ensure that the net maintained clearance from the tail rotor.NTSB ERA18LA091Accident · Serious injuriesLimited investigationFinal reportHughes 369 · San Juan, PRThe helicopter pilot's improper decision to use an open-end grapple, instead of an A-frame attachment, to lift and move a ladder with a lineman on it and the lineman's improper decision to be lifted on a ladder via an open-end grapple, which were contrary to…NTSB WPR18LA029Accident · Minor injuriesClass 3 · LimitedFinal reportBell 206 · Rolling Fork, MSAn uncommanded yaw and subsequent loss of main rotor rpm for reasons that could not be determined.NTSB CEN17LA314Accident · Serious injuriesLimited investigationFinal reportHughes 369D · Villa Grove, COThe pilot’s failure to maintain main rotor clearance from a power line tower during low-level maneuvering.NTSB GAA17CA402Accident · No injuriesData collectionFinal reportBell 206 · Uniontown, KYThe pilot's failure to maintain adequate separation from power lines, which resulted in a loss of helicopter control.NTSB GAA17CA369Accident · No injuriesData collectionFinal reportBell 206B · Entiat, WAThe pilot’s failure to secure a loose item inside the cockpit that interfered with antitorque pedal control and led to a loss of helicopter control due to a loss of tail rotor effectiveness.NTSB ERA17LA209Accident · No injuriesLimited investigationFinal reportHughes 369 · Dennis, WVThe unporting of fuel due to the helicopter's nose-up attitude during long line operations, which resulted in fuel starvation and a total loss of engine power.NTSB ERA17TA170Accident · Serious injuriesFinal reportBell 206 · Orange Springs, FLThe pilot's failure to maintain adequate clearance between the helicopter's skid and the firefighting bucket and suspension cable, which resulted in the cable becoming entangled on the landing skid and a subsequent loss of helicopter control.NTSB GAA17CA218Accident · No injuriesData collectionFinal reportBell 206 · La Verne, CAThe pilot’s early increased application of the collective during a simulated hovering autorotation, which resulted in a loss of rotor rpm and subsequent main rotor blade strike of the tailboom.NTSB WPR17LA075Accident · Serious injuriesLimited investigationFinal reportHughes 369A · (Pacific Ocean)The pilot's failure to detect the presence of water in the helicopter fuel system before the flight, which resulted in a total loss of engine power during cruise. Contributing to the accident was the pilot's delayed recognition of the power loss and late…NTSB CEN17FA100Accident · 1 fatalField investigationFinal reportBell 206B · Galveston, TXThe pilot's failure to recognize the flight had encountered instrument meteorological conditions at night, which resulted in an unrecognized descent and collision with water.NTSB WPR16LA188Accident · No injuriesLimited investigationFinal reportBell 206B · Rockport, WAThe pilot's failure to maintain helicopter control while on the ground, which resulted in mast bumping.
Back to Allison 250-C20 series