Hiller UH-12E
NTSB investigations · 415
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.aircraft_model_code IN ('4360122', '4360137')
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.aircraft_model_code IN ('4360122', '4360137')
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 CEN26LA175Accident · No injuriesClass 3 · LimitedPreliminary reportHiller UH-12E · Chickasha, OKOn April 30, 2026, about 1730 central daylight time, a Hiller UH-12E, N22SP, was substantially damaged when it was involved in an accident near Chickasha, Oklahoma. The pilot was not injured. The helicopter was operated as a Title 14 Code of Federal…NTSB WPR25LA246Accident · No injuriesClass 4 · LimitedFinal reportHiller UH-12E · Fobes Hill, WAThe pilot’s abrupt maneuver to avoid a powerline during an aerial application flight, which resulted in the helicopter’s impact with terrain.NTSB CEN25LA143Accident · No injuriesClass 4 · LimitedFinal reportHiller UH12-ET · Ruston, LAThe pilot’s improper fuel planning and fuel management, which resulted in a total loss of engine power due to fuel exhaustion and subsequent impact with terrain during an autorotation.NTSB WPR24LA262Accident · No injuriesClass 4 · LimitedFinal reportHiller UH-12E · Bonners Ferry, IDThe pilot’s improper selection of a landing site, which resulted in a main rotor strike. Contributing to the accident was the pilot’s improper performance planning and altitude selection over water, which resulted in an rpm droop.NTSB WPR22LA245Accident · Serious injuriesClass 4 · LimitedFinal reportHiller UH-12E · Wenatchee, WAThe pilot’s failure to maintain clearance from power lines during low-level operations in light rain conditions.NTSB CEN22LA318Accident · Serious injuriesClass 3 · LimitedFinal reportHiller UH12E · Becker, MNThe in-flight failure of the main rotor mast hub due to several undetected fatigue fractures.NTSB ERA21LA386Accident · Minor injuriesClass 3 · LimitedFinal reportHiller UH-12E · Millen, GAThe improper reassembly of the tail rotor gearbox following maintenance, which resulted in fatigue failure of the input pinion gear shaft, and the subsequent loss of tail rotor drive.NTSB WPR21LA354Accident · No injuriesClass 3 · LimitedFinal reportHiller UH-12E · Bovill, IDA loss of helicopter control for undetermined reasons based on the available evidence for this accident.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 WPR20LA007Accident · Minor injuriesClass 3 · LimitedFinal reportHiller UH 12E · Susanville, CAA partial loss of engine power due to multiple overtemperature events and a hot start event, which resulted in thermally damaged internal components of the engine. Contributing to the accident was the lack of suitable terrain on which to perform the forced…NTSB GAA18CA573Accident · No injuriesData collectionFinal reportHiller UH 12E · Frankfort, KSThe ground crewmember's improper grabbing of the hovering helicopter's skid during an external load hook-up, which resulted in the helicopter descending and the main rotors striking ground equipment.NTSB WPR15LA168Accident · 1 fatalLimited investigationFinal reportHiller UH 12E · Wasco, CAAn in-flight impact with terrain for reasons that could not be determined based on available evidence.NTSB WPR15LA138Accident · No injuriesLimited investigationFinal reportHiller UH 12E · Firebaugh, CAA loss of engine power for reasons that could not be determined because postaccident examination of the engine did not reveal any anomalies that would have precluded normal operation.NTSB ERA14LA405Accident · Minor injuriesLimited investigationFinal reportHiller UH 12E · Cape May Court House, NJThe mechanic’s failure to detect excessive wear on the engine’s lateral snubber vibration mount during the latest annual inspection, which resulted in an in-flight engine failure and a subsequent forced landing.NTSB ERA14LA361Accident · No injuriesLimited investigationFinal reportHiller UH 12E · Wadesboro, NCA partial loss of engine power due to the failure of the No. 2 engine accessory gearbox bearing for reasons that could not be determined based on the available information.NTSB WPR14LA062Accident · No injuriesLimited investigationFinal reportHiller UH 12E · Chowchilla, CAThe failure of the torsional drive coupling, which resulted in a loss of drive to the main rotor system during low-altitude flight.NTSB WPR11LA267Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Lost Hills, CAThe failure of the engine-driven fuel pump, resulting in the loss of all engine power and the pilot's failure to correctly execute an autorotational landing.NTSB WPR11LA244Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Stockton, CAThe pilot's failure to maintain clearance from obstacles.NTSB ERA11LA216Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Culpeper, VAMechanical failure of the transmission for reasons that could not be determined because the transmission could not be torn down.NTSB WPR11CA146Accident · No injuriesData collectionFinal reportHiller UH-12E · Colusa, CAThe pilot's failure to maintain an adequate airspeed and an inadvertent encounter with settling with power while flying downwind.NTSB WPR10CA466Accident · Minor injuriesData collectionFinal reportHiller UH-12E · Mecca, CAThe pilot's failure to maintain clearance from an obstacle while maneuvering.NTSB WPR10FA440Accident · 3 fatalField investigationFinal reportHiller UH 12E · Kamiah, IDIn-flight impact of a passenger's metal clipboard with the helicopter’s tail rotor, which resulted in destruction of the tail rotor and subsequent loss of control of the helicopter. The original location of the clipboard and how it became free could not be…NTSB ERA10LA383Accident · Serious injuriesLimited investigationFinal reportHiller UH-12E · Holly Hill, SCMaintenance personnel's improper inspection and cleaning of the fuel nozzle, which resulted in a total loss of engine power.NTSB CEN10CA362Accident · Minor injuriesData collectionFinal reportHiller UH-12E · Grand Junction, COThe total loss of engine power for undetermined reasons.NTSB WPR10LA127Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Los Banos, CAA partial loss of engine power due to a failure of the throttle interconnect hardware, which resulted in a hard landing.NTSB WPR10CA094Accident · Minor injuriesData collectionFinal reportHiller UH-12E · Tipton, CAThe pilot's failure to maintain clearance from terrain.NTSB CEN09CA359Accident · No injuriesData collectionFinal reportHiller UH-12E · Stringtown, OKThe pilot's failure to maintain clearance from power lines. Contributing to the accident was the pilot's preoccupation with personal affairs.NTSB WPR09LA028Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Powder River, WYA flight control system malfunction while the helicopter was maneuvering at low altitude due to the failure/separation of the rotor blade control tube.NTSB NYC08LA318Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Naruna, VAThe fatigue failure of a main rotor blade drag strut.NTSB CHI08CA252Accident · No injuriesData collectionFinal reportHiller UH-12E · Cokato, MNThe pilot did not visually identify and maintain clearance with the power lines, and the pilot's inability to maintain control of the helicopter once it contacted the power lines. Factors associated with the accident were the low altitude operations being…NTSB DFW08LA100Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Quinton, OKAn undetermined mechanical malfuction associated with the tail rotor drive system which led to a loss of control.NTSB DEN08LA071Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · La Porte, TXThe loss of tail rotor effectiveness. Contributing factors were the sudden windshift to a tailwind, and the pilot initiating a hovering turn in ground effect.NTSB SEA08LA038Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Yuma, AZFatigue fracture of the control rotor blade spar and failure of maintenance personnel to follow maintenance directives.NTSB ANC07LA062Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Skwentna, AKThe pilot's failure to maintain clearance from a glacier, which resulted in a tail rotor strike during landing, and damage to the helicopter during an emergency descent/landing on rough/uneven terrain. Factors contributing to the accident were variable and…NTSB DFW06CA013Accident · Serious injuriesData collectionFinal reportHiller UH-12E · Pasadena, TXThe pilot's inadequate fuel management, which resulted in fuel exhaustion and a loss of engine power. A contributing factor was the lack of suitable terrain for the forced landing.NTSB LAX05CA313Accident · No injuriesData collectionFinal reportHiller UH 12-E · Five Points, CAThe pilot's failure to refuel the helicopter, which resulted in fuel exhaustion.NTSB DFW05CA208Accident · Serious injuriesData collectionFinal reportHiller UH-12E · Hampton, ARA loss of engine power due to fuel exhaustion as a result of the pilot's failure to refuel. A factor was unsuitable terrain to complete a successful autorotation.NTSB SEA05CA104Accident · Minor injuriesData collectionFinal reportHiller UH-12E · Estacada, ORThe failure of the pilot to maintain landing skid clearance during hover taxi, which resulted in a dynamic rollover. A factor was the gusty wind condition.NTSB SEA04LA073Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Haines, ORA momentary partial loss of power for undetermined reason(s) and the pilot's failure to maintain adequate RPM during his autorotation landing.NTSB LAX03CA284Accident · No injuriesData collectionFinal reportHiller UH12E · Kekaha, HIthe pilot's failure to maintain clearance with the wires due to an inadequate visual lookout.NTSB CHI03LA185Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Elk Mound, WIThe pilot's failure to maintain clearance from the terrain. Factors contributing to the accident were the whirlwind, the turbulence, and the helicopter's low altitude.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 SEA02LA073Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Goshen, ORThe failure of company maintenance personnel to identify and replace/repair the degraded exhaust stack. Contributing factors were the mis-rigged carburetor heat control and the pilot's failure to maintain appropriate rotor RPM. Additional contributing factors…NTSB ATL02LA044Accident · Minor injuriesLimited investigationFinal reportHiller UH12E · Miami, FLFatigue cracking in the main rotor hub that resulted in the separation of the main rotor system. A factor was corrosive deposits on the exposed portion of the plate set pin.NTSB CHI01LA238Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Hastings, NEAircraft control not being maintained by the pilot which resulted in the encountered settling with power flight condition during the initial climb. Factors to the accident were the reported variable winds during the takeoff and the corn crop.NTSB LAX01LA245Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Blythe, CAThe selection by the pilot of an unsuitable precautionary landing site on soft, uneven terrain, which resulted in a rollover.NTSB MIA01LA055Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Cleveland, TNThe PIC's failure to follow safe operating procedures for the maintenance of the rotorcraft's external aerial application equipment, resulting in inadvertent activation of collective as he egressed the rotorcraft, causing unmanned flight, in-flight break-up,…NTSB ATL00LA043Accident · No injuriesLimited investigationFinal reportHiller UH-12ET · Stonesboro, SCThe pilot's improper inflight decision not to refuel which resulted in fuel exhaustion and a total loss of engine power.NTSB LAX00LA077Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Five Points, CAThe pilot's inadequate clearance while maneuvering beneath a telephone line.NTSB SEA00TA013Accident · Serious injuriesFinal reportHiller UH-12E · Stites, IDInadequate inspection of the control rotor cuff by a company mechanic and subsequent fatigue fracture of the cuff, resulting in an inflight separation of the control rotor blade. Factors contributing to the accident were: inadequate quality control during…
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