NTSB investigations: Allison 250-C20 series
372 cases on aircraft whose registry engine model is Allison 250-C20 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 ('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_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 ('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 ERA16LA104Accident · Serious injuriesLimited investigationFinal reportBell 206 · Linden, NJThe pilot receiving instruction's failure to maintain helicopter control during the initial takeoff, which resulted in a dynamic rollover. Contributing to the accident was the flight instructor's inadequate remedial action due to his distraction by looking…NTSB ERA16LA030Accident · No injuriesLimited investigationFinal reportHughes 369D · Marion, SCA momentary jam in the tail rotor control system from an undetermined source, resulting in a torsional fracture of the tail rotor control torque tube and a loss of helicopter control.NTSB ERA16LA015Accident · No injuriesLimited investigationFinal reportBell 206L 3 · Dickinson, ALThe improper installation by company maintenance personnel of the securing hardware of a tail rotor driveshaft section, which resulted in that section of tail rotor driveshaft disconnecting and a complete loss of tail rotor thrust.NTSB CEN15LA423Accident · Serious injuriesLimited investigationFinal reportBell 206B · Woodville, TXThe loss of engine power due to water contamination in the fuel system. Contributing to the accident were the pilot’s inadequate preflight inspection of the fuel tanks and the operator’s inadequate inspection of the fuel supply truck that did not detect water…NTSB ERA15LA337Accident · Serious injuriesLimited investigationFinal reportMcdonnell Douglas Helicopter 369E · New Smyrna Beach, FLThe pilot’s inadequate visual lookout and failure to maintain clearance from trees while maneuvering at low altitude.NTSB GAA15CA102Accident · No injuriesData collectionFinal reportBell 206 - B11 · Caledonia, MIA loss of tail rotor effectiveness while maneuvering at low altitude, resulting in a collision with trees.NTSB ERA15CA055Accident · No injuriesData collectionFinal reportMcdonnell Douglas Helicopter MD500 · Decatur, ALAn undetermined pilot's failure to maintain clearance from an electrical transmission tower resulting in substantial damage to a main rotor blade. Postaccident investigation could not determine which of two pilots was flying the helicopter at the time the…NTSB ERA15CA018Accident · No injuriesData collectionFinal reportBell 206B · Prattville, ALThe pilot's improper fuel planning, which resulted in a total loss of engine power due to fuel exhaustion.NTSB CEN15CA007Accident · Serious injuriesData collectionFinal reportBell 206B · Atlanta, ARThe pilot's inadequate preflight inspection when he did not remove a tie-down strap prior to takeoff, which resulted in a dynamic rollover.NTSB CEN14CA525Accident · No injuriesData collectionFinal reportBell 206B · Nashoba, OKThe pilot's loss of directional control due a loss of tail rotor effectiveness.NTSB WPR14CA363Accident · Serious injuriesData collectionFinal reportHughes 369D · Willows, CAThe pilot's failure to adequately secure cargo (a jacket), which resulted in the jacket exiting the cabin compartment and colliding with the tail rotor during cruise flight.NTSB ERA14FA396Accident · 2 fatalField investigationFinal reportMcdonnell Douglas Helicopter 369E · Northport, ALAn inadvertent collision with a utility wire for reasons that could not be determined from recorded data and examination of the helicopter and accident site.NTSB WPR14LA308Accident · Serious injuriesLimited investigationFinal reportMdhi 369D · Oso, WAThe pilot/mechanic’s failure to properly perform required inspections of the main rotor blades at the necessary intervals, which resulted in an in-flight separation of a main rotor blade due to disbonding and fatigue cracking. Contributing to the accident was…NTSB CEN14LA296Accident · Minor injuriesLimited investigationFinal reportBell 206B · Decatur, TXThe flight instructor’s improper recovery from a practice autorotation, which resulted in a hard landing.NTSB CEN14IA270Incident · No injuriesIncident investigationFinal reportBell 407 · Eugene Island 182AThe improper repair of the outer combustion case, which led to its ultimate failure due to the continued progression of a fatigue crack and resulted in a partial loss of engine power during takeoff.NTSB WPR14LA159Accident · Minor injuriesLimited investigationFinal reportBell 206B III · Missoula, MTA dynamic rollover during attempted liftoff.NTSB WPR14LA113Accident · No injuriesLimited investigationFinal reportBell 206 · Bountiful, UTThe pilots' inaccurate assessment of the snow depth on the landing zone, which resulted in a landing on snow deeper than that for which the helicopter was equipped and led to dynamic rollover.NTSB WPR13GA374Accident · No injuriesFinal reportMcdonnell Douglas Helicopter 369E · Burns, ORThe total loss of engine power during cruise flight due to the separation of one of the 4th-stage turbine wheel blades due to low-cycle fatigue cracking that had progressed to high-cycle fatigue cracking, which ultimately led to the overload failure of the…NTSB WPR13LA358Accident · Minor injuriesLimited investigationFinal reportBell 206B · Chualar, CAMaintenance personnel's failure to properly tighten the bolts securing the main driveshaft to the transmission, which resulted in fatigue failure of the bolts and disconnection of the driveshaft during low-altitude flight.NTSB ERA13TA341Accident · Serious injuriesFinal reportMcdonnell Douglas Helicopter 369E · Jackson, KYThe helicopter pilot's inadvertent collision with an unmarked and uncharted utility wire of which he was unaware.NTSB ERA13LA344Accident · Minor injuriesLimited investigationFinal reportHughes 369D · Center Point, WVA total loss of engine power for reasons that could not be determined because postaccident examination of the airframe and engine did not reveal any anomalies that would have precluded normal operation.NTSB ANC13LA066Accident · Minor injuriesLimited investigationFinal reportCessna T207A · King Salmon, AKThe pilot’s inadequate visual lookout while departing from a multiple-use waterway, which resulted in a collision with a drifting boat. Contributing to the accident were the lack of visual conspicuity of the boat and the limited amount of time the boat…NTSB WPR13LA287Accident · Serious injuriesLimited investigationFinal reportBell 206B · Royal City, WAThe pilot's failure to maintain clearance from netting material during a low pass over trees, which resulted in a loss of helicopter control.NTSB ERA13LA236Accident · No injuriesLimited investigationFinal reportBell 206B · Hartford, KYThe pilot’s failure to avoid a powerline that crossed a field that he was spraying. Contributing to the collision was the company’s failure to specifically mention that flight hazards be identified during a pre-work conference.NTSB WPR13FA208Accident · 1 fatalField investigationFinal reportBell 206B · Shepherd, MTThe pilot’s loss of control while maneuvering during low-altitude operations due to sudden neurological impairment or incapacitation and the helicopter’s subsequent collision with power lines.NTSB WPR13GA128Accident · 1 fatalFinal reportBell 206B · Eureka, NVThe pilot’s failure to maintain clearance from a wire while maneuvering during low-altitude operations. Contributing to the accident was task- and/or work-related fatigue.NTSB WPR13CA057Accident · Minor injuriesData collectionFinal reportHughes 369D · Sheridan, ORThe pilot’s failure to prevent the helicopter from entering a vortex ring state (settling with power) condition during an external load operation, which resulted in the helicopter’s main rotor blades impacting the truck.NTSB CEN13FA009Accident · 1 fatalField investigationFinal reportBell 206B · Crowley, LAThe pilot’s failure to maintain clearance from the broadcast tower guy-wires.NTSB WPR12LA328Accident · Serious injuriesLimited investigationFinal reportHughes Helicopters 369E · The Dalles, ORThe loss of engine power due to fuel starvation, which resulted from the fuel tank supply pickup becoming unported while the helicopter was pulling power lines.NTSB CEN12FA321Accident · 1 fatalField investigationFinal reportBell 206-L4 · (Gulf of Mexico)The pilot’s failure to maintain clearance from an obstacle while landing on an obstructed helipad, which resulted in a collision and loss of control. Contributing to the accident was the failure of the helipad owner to mark the helipad closed and the failure…NTSB CEN12CA319Accident · Serious injuriesData collectionFinal reportHughes 369HS · Delavan, MNThe pilot’s failure to maintain clearance with power lines during an aerial application flight.NTSB WPR12LA125Accident · No injuriesLimited investigationFinal reportAerospatiale AS 355F1 · Makakilo City, HIA partial loss of engine power while maneuvering over rough/uneven terrain that was precipitated by the failure of a 3rd stage turbine blade as a result of high-cycle fatigue.NTSB CEN11CA533Accident · No injuriesData collectionFinal reportGarlick Helicopters OH-58C · Rushford, MNThe pilot's diverted attention, which resulted in the failure to maintain clearance from the power line.NTSB CEN11CA509Accident · No injuriesData collectionFinal reportBell 206B · Temple, OKThe pilot’s failure to maintain clearance from static power lines.NTSB CEN11CA303Accident · Minor injuriesData collectionFinal reportBell 206 · Venice, LAThe pilot's improper use of the collective and cyclic control during taxi operations, which induced a dynamic rollover.NTSB WPR11LA151Accident · No injuriesLimited investigationFinal reportBell 206B-III · Tooele, UTThe pilot did not maintain yaw control of the helicopter during a maneuvering hover. Contributing to the accident was the pilot’s lack of experience in the make and model helicopter.NTSB CEN11WA042Accident · 3 fatalForeign investigationAgusta A109 · New Castle, United KingdomNTSB CEN10CA545Accident · Serious injuriesData collectionFinal reportAerospatiale AS 355F1 · Pikes Peak, COThe helicopter's encounter with an unexpected downdraft, which resulted in a hard landing.NTSB WPR10CA314Accident · No injuriesData collectionFinal reportBell 206B · Rickreall, ORA total loss of engine power due to fuel exhaustion as a result of the pilot's failure to ensure that adequate fuel was aboard for the flight.NTSB ERA10LA238Accident · Serious injuriesLimited investigationFinal reportMcdonnell Douglas Helicopter 369E · Newfane, VTThe pilot's inadvertent encounter with a rope while maneuvering during powerline operations for undetermined reasons.NTSB ERA10LA032Accident · Serious injuriesLimited investigationFinal reportBell 206 · Eupora, MSA loss of engine power due to fuel contamination of the helicopter’s fuel supply.NTSB WPR10TA025Accident · No injuriesFinal reportMcdonnell Douglas Helicopter 500N · Los Alamitos, CAThe flight instructor's delayed remedial action during the instructional autorotative landing, which resulted in a failure to maintain an adequate rotor rpm to avoid a hard landing.NTSB CEN09LA571Accident · Minor injuriesLimited investigationFinal reportMesserschmitt-Boelkow-Blohm BO-105S · Thibodaux, LAThe pilot's inability to maintain control due to the mechanic's inadvertent switching of two cyclic control tubes of different lengths during maintenance.NTSB ERA09LA460Accident · Serious injuriesLimited investigationFinal reportMcdonnell Douglas Helicopter 369E · Acworth, GAThe loss of engine power due to the fatigue failure of the third-stage turbine wheel airfoil.NTSB ERA09FA414Accident · 1 fatalField investigationFinal reportHughes 369 · Franklin, PAA loss of engine power due to fuel exhaustion as a result of the pilot's fuel mismanagement.NTSB WPR09CA338Accident · No injuriesData collectionFinal reportBell 206B · Burlington, WAThe pilot’s failure to maintain control of the helicopter while attempting to lift off from a trailer. The helicopter subsequently impacted the ground and rolled over.NTSB CEN09CA275Accident · No injuriesData collectionFinal reportBell 407 · High Island 138The pilot's failure to maintain clearance from the windsock during the approach.NTSB WPR09LA244Accident · No injuriesLimited investigationFinal reportHughes 369HS · Pacific Ocean (Pacific Ocean)The pilot’s failure to maintain clearance from an object during takeoff from the deck of a fishing vessel.NTSB CEN09IA222Incident · No injuriesIncident investigationFinal reportBell 206 · Springfield, ILThe pilot's failure to maintain clearance from the parked helicopter.NTSB ERA09WA183Accident · No injuriesForeign investigationBell 206B · St. Maarten, NTNone.