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 DFW05FA032Accident · Serious injuriesField investigationFinal reportHughes 369D · Zachary, LAThe loss of engine power as a result of fatigue cracking of the compressor adaptor coupling initiated by fretting on the pilot diameter and subsequent disconnection of the compressor from the turbine assembly. A contributing factor was the low operating…NTSB DEN05LA024Accident · No injuriesLimited investigationFinal reportBell 206B3 · Eureka, UTthe pilot's improper in-flight planning and decision making and failure to maintain obstacle clearance, resulting in contact with a power transmission line. Contributing factors include the intentional low-level maneuver, the power transmission line, and the…NTSB MIA05FA008Accident · 3 fatalField investigationFinal reportEurocopter Deutschland BO-105 CBS5 · Santa Rosa Bch, FLThe pilot's spatial disorientation and in-flight loss of control of the helicopter after encountering night instrument meteorological conditions resulting in collision with water during the resultant uncontrolled descent. A factor in the accident was the…NTSB MIA04LA132Accident · No injuriesLimited investigationFinal reportBell 206L · Gulf of MexicoA loss of engine power for undetermined reasons while on short final to land on an oil platform in the Gulf of Mexico, which resulted in the pilot ditching the helicopter into the water.NTSB MIA04LA129Accident · Minor injuriesLimited investigationFinal reportBell 206B3 · Starkville, MSThe operator's inadequate maintenance inspections and the pilot's inadequate preflight inspection, which resulted in the helicopter being operated with a contaminated fuel system, that resulted in fuel starvation, and the loss of engine power.NTSB FTW04TA237Accident · 1 fatalFinal reportBell OH-58C · Beaumont, TX**This probable cause was modified on 2/22/2016. Please see the public docket for this accident for additional details.** The pilot's failure to maintain a safe altitude, resulting in collision with the water. A factor was the dark night.NTSB ATL04LA181Accident · Minor injuriesLimited investigationFinal reportHughes HU-369-D · Waynesboro, GAThe tail rotor assembly failed due to a fatigue fracture of the input gearshaft in the tail rotor gearbox assembly, which resulted in a loss of tail rotor control and subsequent collision with trees.NTSB SEA04LA181Accident · No injuriesLimited investigationFinal reportHughes 369D · Cottage Grove, ORIn-flight loss of engine power during cruise for undetermined reasons.NTSB MIA04LA123Accident · No injuriesLimited investigationFinal reportBell 206B3 · Panama City, FLInadequate maintenance inspection resulting in the partial loss of engine power due to a loose pneumatic line on the governor and ditching of the helicopter.NTSB MIA04LA121Accident · Minor injuriesLimited investigationFinal reportMcDonnell Douglas 369E · Ochopee, FLThe pilot's loss of control in flight for undetermined reasons, which resulted in an uncontrolled descent, and subsequent impact with trees and the terrain.NTSB SEA04TA163Accident · 1 fatalFinal reportBell 206B · Mead, WAThe reversal of the reel machine during a sock line pull which resulted in a loss of control while hovering out of ground effect. Factors were the failure of company management to develop adequate procedures for conducting sock line pulls, the inadequate…NTSB LAX04CA315Accident · Minor injuriesData collectionFinal reportBell 206B · Kahului, HIthe pilot's inadequate compensation for the gusty crosswind conditions, which resulted in a dynamic rollover. Contributing factors were the direct crosswind and his lack of total experience in the accident helicopter make and model.NTSB FTW04LA197Accident · Minor injuriesLimited investigationFinal reportBell 206B · East Cameron 13The loss of engine power due to fuel exhaustion. Contributing factors were the fuel quantity gauge's improper fuel level indication, missing instrument placard, company maintenance personnel's improper maintenance records, disregard for company procedures,…NTSB FTW04GA076Accident · Minor injuriesFinal reportSchweizer 269D · San Antonio, TXThe loss of engine power due to the axial movement of the compressor rotor blades contacting the compressor vanes resulting in a subsequent compressor stall. A contributing factor was the improper assembly of the compressor section during the engine overhaul…NTSB FTW04TA075Accident · Minor injuriesFinal reportBell 206B · Decatur, TXThe pilot's failure to maintain control of the helicopter during liftoff after encountering dynamic rollover. A contributing factor was the rough and uneven terrain.NTSB LAX04LA116Accident · No injuriesLimited investigationFinal reportHughes 369D · Wahiawa, HIThe pilot's failure to properly secure the external sling load, which allowed the load to shift, and subsequently strike and remove the tail rotor.NTSB CHI04LA027Accident · Minor injuriesLimited investigationFinal reportBell 206B · Coleman, WIThe loss of engine power for undetermined reasons and the unsuitable terrain encountered for the forced landing. The garage building was a factor.NTSB CHI04LA017Accident · Minor injuriesLimited investigationFinal reportHughes 369HS · Evansville, MNThe pilot's misjudgment of clearance from the surface of the lake during the aerial application pass. The low altitude operation, glassy water, and his visual perception were contributing factors.NTSB FTW03LA216Accident · No injuriesLimited investigationFinal reportBell 206B-3 · Kisatchie, LAA loss of engine power due to water contamination in the fuel system.NTSB FTW03LA197Accident · Minor injuriesLimited investigationFinal reportBell 206B · Mason, TXThe pilot's failure to maintain clearance with the power line. A contributing factor was the sunglare.NTSB SEA03FA169Accident · Serious injuriesField investigationFinal reportAerospatiale AS350D · Webb, IDAn over temperature condition within the gas generator turbine which led to first stage turbine blade fatigue as well as first stage blade track warping and consequent blade tip rub. The fatigue and blade tip rub ultimately led to blade separation and failure…NTSB MIA03TA152Accident · No injuriesFinal reportBell BHT-206-B3 · Fort Myers, FLThe pilot's failure to adequately clear the right skid of obstructions which resulted in a dynamic rollover to the right during takeoff and damage to the helicopter.NTSB ANC03LA073Accident · Minor injuriesLimited investigationFinal reportBell 206B · Aniak, AKThe compressor discharge pressure line (Pc line) B-nut coming loose at the fuel control unit, which resulted in a total loss of engine power, and subsequent in-flight collision with trees during an autorotation. A factor associated with the accident was the…NTSB CHI03LA172Accident · Minor injuriesLimited investigationFinal reportBell 206B · Baxter, MNThe pilot's failure to maintain control of the helicopter due to a loss of tail rotor effectiveness. Factors contributing to this accident were the helicopter's low airspeed, low altitude, the crosswind, and the trees.NTSB MIA03FA120Accident · Minor injuriesField investigationFinal reportAerospatiale AS355F1 · Madison, FLThe pilot in command's diverted attention and loss of control while attempting to takeoff, which resulted in the main rotor blades being dragged, and the helicopter rolling over.NTSB LAX03LA183Accident · Minor injuriesLimited investigationFinal reportBell 206B · Malone, TXa fuel starvation induced loss of engine power due to fuel contamination.NTSB DEN03LA092Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Cheyenne, WYthe pilot's failure to maintain aircraft control. A contributing to the accident was the sudden tailwind encountered.NTSB ATL03LA095Accident · No injuriesLimited investigationFinal reportAerospatiale AS355F2 · Bainbridge, GAThe pilot's improper flare during an attempted landing.NTSB FTW03LA147Accident · No injuriesLimited investigationFinal reportBell 206B · Hurst, TXThe improper flare by the pilot receiving instruction, which resulted in the hard landing. A contributing factor was the flight instructor's inadequate supervision.NTSB FTW03LA134Accident · No injuriesLimited investigationFinal reportHughes 369HS · Conroe, TXThe pilot's inability to control the helicopter after encountering loss of tail rotor effectiveness. A contributing factor was the unfavorable winds.NTSB SEA03LA058Accident · Minor injuriesLimited investigationFinal reportHughes 369D · Taholah, WAThe entanglement of the fuel quantity sender float in the start pump wiring within the fuel tank as a result of the wiring not being properly secured. This rendered the fuel gauge inaccurate and the low fuel warning light inoperative which led to fuel…NTSB FTW03FA118Accident · 2 fatalField investigationFinal reportBell 407 · Broadus, TXThe partial loss of engine power due to erratic fuel flow metering to the engine resulting from the single point failure of the PLA potentiometer in the hydro-mechanical fuel control unit. A contributing factor was the lack of suitable terrain to execute a…NTSB CHI03FA060Accident · 1 fatalField investigationFinal reportAgusta A109C · West Chicago, ILThe pilot's failure to maintain control of the helicopter while maneuvering, resulting in the excessive descent rate and impact with terrain. Factors to the accident included the dark night, low ceiling and reduced visibility at the time of the accident.NTSB FTW03LA080Accident · Serious injuriesLimited investigationFinal reportBell 206B · Putnam, TXthe pilot's failure to properly interpret and confirm a faulty tachometer instrument indication and his improper flare during the ensuing precautionary autorotation, which resulted in a hard landing. Also causal was the failure of the tachometer.NTSB NYC03LA031Accident · No injuriesLimited investigationFinal reportBell 206B · Odenton, MDThe pilot's failure to monitor his fuel supply which resulted in a power loss due to fuel exhaustion, and the pilot's misjudged flare, which resulted in a hard landing.NTSB LAX03LA017Accident · Serious injuriesLimited investigationFinal reportHughes 369D · Kaaawa, Oahu, HIDynamic rollover during an attempted takeoff, due to the combined effects of the soft sloping terrain and the pilot's failure to redistribute the passengers to a more favorable lateral CG condition.NTSB IAD02LA094Accident · 1 fatalLimited investigationFinal reportGarlick OH-58AT · Rochester, MAThe pilot's failure to center the sling load prior to commencing forward flight. Also causal, was the pilot's improper decision to attempt a takeoff with a quartering tailwind, which resulted in an engine compressor stall.NTSB SEA02LA137Accident · No injuriesLimited investigationFinal reportBell 206B · Elsie, ORThe shattering and separation of the forward right (pilot's) windscreen for undetermined reason(s).NTSB DEN02FA065Accident · 2 fatalField investigationFinal reportBell 206BIII · Raton, NMThe pilot's failure to maintain clearance of the static wire. Factors were the static wire, and the glaring sunlight condition.NTSB LAX02GA209Accident · Serious injuriesFinal reportMcDonnell Douglas 369E · Ontario, CAThe mechanic's improper maintenance procedures (FOD prevention) during a 100-hour inspection, which resulted in foreign object damage (FOD) to the compressor section and catastrophic engine failure. Factors were the presence of vehicles and power lines…NTSB NYC02LA105Accident · No injuriesLimited investigationFinal reportBell 206 · Columbus, OHThe flight instructor's delay in applying remedial action. A factor in the accident was the pilot allowing the rotor rpm to become too low during the deceleration and touchdown phase of the autorotation.NTSB DEN02LA046Accident · No injuriesLimited investigationFinal reportBell 206B-III · Moab, UTThe pilot's failure to maintain rotor rpm during a forced landing. A contributing factor was fuel starvation.NTSB FTW02LA143Accident · Serious injuriesLimited investigationFinal reportBell 206B · Rosenberg, TXThe pilot's failure to maintain terrain clearance.NTSB FTW02LA117Accident · Minor injuriesLimited investigationFinal reportBell 206B · Walnut Hill, TXThe loss of engine power as a result of the backing off of the PC air line "B" nut due to the improper installation by the company maintenance personnel. Contributing factors were the inadequate preflight by the pilot and the lack of suitable terrain for the…NTSB DEN02LA036Accident · No injuriesLimited investigationFinal reportBell 206B-III · Leadville, COthe pilot's inadvertent flight into adverse weather, which resulted in a collision with terrain. A contributing factor was the downdraft.NTSB FTW02LA102Accident · No injuriesLimited investigationFinal reportBell 206L-3 · Oakley, UTThe loss of engine power for an undetermined reason. A contributing factor was the lack of suitable terrain for the forced landing.NTSB FTW02FA099Accident · 1 fatalField investigationFinal reportBell 206L-4 · Eugene Isld 188The pilot's failure to maintain aircraft control during takeoff. A contributing factor was the pilot's inadequate preflight which resulted in his failure to remove the left front tie down.NTSB SEA02FA030Accident · Serious injuriesField investigationFinal reportAgusta A109A II · Baring, WAThe sequential non-mechanical total loss of power in both engines 1 and 2 for undetermined reasons and the pilot's failure to maintain adequate rotor RPM to prevent a hard landing. Contributing factors were the tripped "RPM WARN" circuit breaker which…NTSB DEN02GA016Accident · 3 fatalFinal reportHughes 369E · Park City, UTthe pilot's inadequate visual lookout, resulting in an inflight collision with powerlines. Contributing factors were the fog and the powerlines.NTSB ATL02TA021Accident · No injuriesFinal reportBell 206 · Awendaw, SCThe pilot's failure to maintain clearance from the bambi bucket suspension assembly during dip operation.