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 ERA09LA047Accident · Minor injuriesLimited investigationFinal reportBell 206B · Boynton Beach, FLA loss of engine power due to an undertorqued air line fitting to the fuel control.NTSB ERA09IA499Incident · No injuriesIncident investigationFinal reportMcdonnell Douglas Helicopter 369E · Allentown, PAThe fatigue failure of a blade in the second-stage turbine wheel, which resulted in a total loss of engine power.NTSB SEA08LA213Accident · Serious injuriesLimited investigationFinal reportBell 206B · Woods Landing-Jelm, WYThe pilot's encounter with a loss of tail rotor effectiveness event and his failure to maintain directional control while maneuvering. Contributing to the accident were the tailwind condition and the sloping, uneven terrain.NTSB NYC08CA309Accident · No injuriesData collectionFinal reportBell 206B · Eutaw, ALThe pilot's inadequate preflight inspection.NTSB SEA08FA071Accident · Minor injuriesField investigationFinal reportMcdonnell Douglas 369E · Hilo, HIA leak in the fuel filter pressure differential switch that resulted in a loss of engine power. Contributing to the accident was uneven terrain that hindered a successful emergency landing.NTSB CHI08CA021Accident · Minor injuriesData collectionFinal reportBell 206B-III · Medora, NDThe pilot failed to maintain clearance from the fence while maneuvering at a low altitude, which resuled in the helicopter rolling over and impacting the terrain. A factor associated with the accident was the fence.NTSB SEA07CA256Accident · Minor injuriesData collectionFinal reportRogerson Hiller RH-1100 · Stanwood, WAThe pilot's failure to execute a go-around and his failure to reduce his groundspeed to zero prior to touching down on the rough/uneven terrain. Factors include the momentary restriction of a flight control, rough/uneven terrain, and a tailwind.NTSB LAX07LA270Accident · 1 fatalLimited investigationFinal reportHughes 369D · Ellensburg, WAThe passenger's inadequate visual lookout and failure to maintain clearance from the rotating main rotor disc while the helicopter was hovering. An uphill terrain condition was a factorNTSB NYC07LA188Accident · No injuriesLimited investigationFinal reportBell 206B · Warrenton, VAThe flight instructor's failure to maintain adequate rotor rpm during touchdown.NTSB DEN07LA132Accident · Minor injuriesLimited investigationFinal reportBell 206B · Broomfield, COThe pilot's failure to maintain control of the helicopter, resulting in an inadvertent dynamic rollover.NTSB CHI07CA244Accident · Minor injuriesData collectionFinal reportBell 206B · Columbia, MOThe pilot's failure to maintain control of the helicopter, which resulted in impact with terrain during takeoff. A factor in the accident was the tall grass.NTSB SEA07CA200Accident · Minor injuriesData collectionFinal reportBell 206B II · Sheep Mountain, MTThe external load net, attached directly to the cargo hook without the use of a long line, oscillated and made contact with the tail rotor system while maneuvering.NTSB CHI07LA193Accident · No injuriesLimited investigationFinal reportHughes 369D · Comfrey, MNThe loss of engine power due to the loose pressure line during aerial application maneuvers which resulted in a hard forced landing.NTSB ATL07GA087Accident · Serious injuriesFinal reportBell 206B · Cedartown, GAThe pilot's failure to maintain control of the helicopter while maneuvering. Contributing to the accident were strong gusty winds.NTSB SEA07CA139Accident · No injuriesData collectionFinal reportHughes 369D · Torrance, CAThe pilot's loss of helicopter control while maneuvering at low altitude, which resulted in a hard landing. The wind gusts were a contributing factor.NTSB NYC07LA149Accident · No injuriesLimited investigationFinal reportMesserschmitt BO-105 · Isla de Vieques, PRThe mechanic's failure to secure the engine governor locking hardware, which resulted in the right engine losing power.NTSB LAX07CA177Accident · Minor injuriesData collectionFinal reportMD Helicopters 500-E · Yerington, NVThe failure of the student and instructor to maintain an adequate main rotor rpm, and the instructor’s inadequate in-flight supervision while conducting a low-level simulated emergency procedure, which resulted in a hard landing.NTSB MIA07FA098Accident · 1 fatalField investigationFinal reportHughes 369A · Moulton, ALThe separation of a main rotor blade from its tension torsion bar for an undetermined reason.NTSB DFW07LA109Accident · Minor injuriesLimited investigationFinal reportBell 206B · E. Cameron 219The pilot's failure to establish a climb and maintian directional control of the helicopter while departing the offshore platform.NTSB SEA07LA108Accident · Minor injuriesLimited investigationFinal reportHughes 369D · Kahuku, HIFatigue cracking of the oil line from the engine gearbox to the oil pressure gauge, which resulted in loss of engine lubricating oil, leading to seizure of the power turbine.NTSB NYC07CA084Accident · Minor injuriesData collectionFinal reportBell 206B · Lewes, DEThe pilot's inadequate visual lookout, which resulted in an in flight collision with utility wires during takeoff, and a subsequent impact with terrain.NTSB SEA07CA069Accident · No injuriesData collectionFinal reportBell 206 B3 · Custer, MTThe pilot’s failure to maintain clearance between the tail rotor of his helicopter and a piece of farm equipment during the landing sequence.NTSB ANC07LA022Accident · No injuriesLimited investigationFinal reportHughes 369D · Gustavus, AKThe inadequate clearance from a tranquilized moose while hovering in ground effect, and the operator's inadequate procedures for such operations, which resulted in an in-flight collision with the moose. Factors associated with the accident were the moose, a…NTSB LAX07CA072Accident · Minor injuriesData collectionFinal reportBell Helicopter 206BIII · Springville, CAThe pilot's failure to maintain terrain/obstacle clearance while maneuvering. Factors were the mountainous terrain, trees, and low-altitude flight maneuvers.NTSB LAX07CA034Accident · No injuriesData collectionFinal reportBell 206B · Boulder City, NVthe pilot's inadequate planning and decision in his failure to reduce the engine throttle to ground idle prior to exiting the helicopter.NTSB LAX06LA288Accident · 2 fatalLimited investigationFinal reportHughes 369D · Somis, CAThe pilot's inadequate visual lookout, which resulted in a collision with wires.NTSB LAX06TA259Accident · No injuriesFinal reportHughes 369D · Lahaina, HIthe pilot's failure to shut down the engine prior to exiting the helicopter resulting in the tail rotor contacting the ground. A contributing factor was the gusting wind conditions present at the accident site.NTSB ANC06CA122Accident · No injuriesData collectionFinal reportBell 206B · Orlando, FLThe pilot's failure to refuel the helicopter prior to the accident flight, which resulted in a loss of engine power during cruise flight, and a hard landing.NTSB NYC06TA190Accident · Minor injuriesFinal reportMD Helicopter 500N · Louisville, KYThe pilot's failure to maintain control of the helicopter and the flight instructor's inadequate supervision, which resulted in a hard landing and subsequent rollover.NTSB SEA06LA135Accident · No injuriesLimited investigationFinal reportHughes 369D · Moab, UTThe failure of the collective bungee support bracket due to non-compliance with a service information notice, which resulted in the pilot executing a precautionary autorotative landing. A contributing factor was the lack of suitable terrain for the landing.NTSB DEN06LA080Accident · No injuriesLimited investigationFinal reportGarlick Helicopters OH- 58C · Muddy Gap, WYthe loss of engine power for reasons undetermined. Contributing to the accident was the low altitude and rough uneven terrain.NTSB NYC06LA122Accident · Minor injuriesLimited investigationFinal reportHughes 369HS · Mattituck, NYA loss of engine power due to undetermined reasons.NTSB LAX06LA161Accident · Minor injuriesLimited investigationFinal reportBell 206B3 · Fallbrook, CAFailure of the engine to transmission drive shaft forward coupling due to overheating from lack of lubrication. The cause of the lack of lubrication was a result of improper maintenance. A factor was the trees.NTSB DFW06CA112Accident · No injuriesData collectionFinal reportBell 206B · Vinita, OKThe pilot's improper pre-flight planning, which resulted in a total loss of engine power due to fuel exhaustion. A contributing factor was the lack of suitable terrain for the forced landing.NTSB SEA06TA071Accident · No injuriesFinal reportBell 206B · Sprague, WAThe pilot's failure to maintain clearance from mountainous terrain while maneuvering. Mountainous terrain was a factor.NTSB MIA06LA044Accident · Minor injuriesLimited investigationFinal reportMBB BO-105S · Ponce, PRA loose B-nut on the PC line connecting the power turbine governor (PTGOV) to the fuel control unit (FCU) that created a leak and caused the engine to roll back to an idle condition, causing a low hydraulic system pressure and subsequent control lock. A…NTSB LAX06LA015Accident · Serious injuriesLimited investigationFinal reportHughes 369D · Avalon, CAthe pilot's failure to maintain an adequate visual lookout and obstacle clearance altitude, which resulted in a collision with power lines. Factors in the accident were the position of the sun relative to the helicopter's flight path, which lessoned the…NTSB SEA05MA202Accident · 3 fatalMajor investigationFinal reportAgusta A109A II · Edmonds, WALoss of control for an undetermined reason during maneuvering flight, which resulted in an in-flight collision with water.NTSB SEA05CA200Accident · Minor injuriesData collectionFinal reportMcDonnell Douglas 369E · Medford, ORIn-flight collision with terrain during a precautionary landing. Factors include instrument meteorological conditions and pilot disorientation.NTSB CHI05CA271Accident · No injuriesData collectionFinal reportBell 206B · Elk Point, SDThe loss of directional control for undetermined reasons which led to the pilot not being able to maintain clearance from the embankment during the forced landing. The rising embankment was a factor.NTSB DFW05LA239Accident · Minor injuriesLimited investigationFinal reportBell 206B · New Orleans, LAThe pilot's failure to maintain directional control after encountering a loss of tail rotor effectiveness. A contributing factor was the lack of suitable terrain.NTSB LAX05LA289Accident · Serious injuriesLimited investigationFinal reportBell 206B · Long Beach, CAthe pilot's decision not to release the banner when it became entangled on itself, which resulted in the banner tow rope becoming ensnarled with the tail rotor system.NTSB DFW05LA252Accident · Minor injuriesLimited investigationFinal reportBell 206B · Myrtle Grove, LAThe pilot's loss of control in flight for undetermined reasons.NTSB DFW05CA172Accident · Serious injuriesData collectionFinal reportGarlick Helicopters OH-58A+ · Graham, TXThe pilot's failure to maintain clearance with the wire while maneuvering during an aerial application flight. Low altitude flight is a contributing factor.NTSB MIA05LA095Accident · Serious injuriesLimited investigationFinal reportBell 206B · Coral Springs, FLThe pilot encountered dynamic rollover while lifting off from an area in the everglades with 6-7 foot tall sawgrass nearby.NTSB MIA05LA088Accident · 1 fatalLimited investigationFinal reportSchweizer 269D · Atlantic Ocean (Atlantic Ocean)An inflight collision with the ocean for undetermined reasons.NTSB ANC05CA049Accident · No injuriesData collectionFinal reportBell 206B · Elim, AKThe pilot's continued flight into adverse weather conditions, and his failure to maintain adequate clearance while maneuvering, which resulted in an in-flight collision with terrain. Factors associated with the accident are flat light, whiteout conditions,…NTSB DFW05FA086Accident · 3 fatalField investigationFinal reportBell 206B-3 · Shelbyville, TXThe pilot's failure to maintain altitude and clearance for undetermined reasons.NTSB NYC05CA047Accident · No injuriesData collectionFinal reportBell 206B · Lancaster, PAThe pilot's loss of lateral control while attempting to transition to a hover from the ground. A factor was the bright sunlight conditions.NTSB DFW05TA056Accident · Minor injuriesFinal reportSchweizer 269D · San Antonio, TXThe inadequate supervision and delayed remedial action by the flight instructor, which resulted in an inadvertent dynamic rollover.