NTSB investigations: Hiller UH-12E
32 cases on aircraft the registry lists as Hiller UH-12E, where the first occurrence was “Airframe/component/system failure/malfunction”. 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 per year
| 1983 | 3 |
|---|---|
| 1984 | 2 |
| 1985 | 1 |
| 1986 | 4 |
| 1987 | 1 |
| 1988 | 1 |
| 1989 | 3 |
| 1990 | 1 |
| 1991 | 1 |
| 1992 | 2 |
| 1993 | 2 |
| 1994 | 1 |
| 1995 | 3 |
| 1996 | 3 |
| 1997 | 1 |
| 1998 | 2 |
| 1999 | 1 |
Where
Open the mapLatest cases
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.aircraft_model_code IN ('4360122', '4360137')
AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o.\"occurrenceNumber\" = 1 AND o.\"occurrenceCode\" = 130))
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.aircraft_model_code IN ('4360122', '4360137')
AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 130))
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 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…NTSB SEA99FA013Accident · 1 fatalField investigationFinal reportHiller UH-12E · Marshall, WAThe loss of the bolt that connects the lateral cyclic linkage push rod to the lower end of the upper firewall-mounted lateral cyclic linkage bellcrank, resulting in an uncontrolled descent into the terrain.NTSB FTW98LA253Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Delaplaine, ARThe failure of maintenance personnel to comply with and airworthiness directive, which resulted in failure of the planetary gear due to lack of lubrication. A contributing factors was the lack of suitable terrain for the pilot to execute a forced landing.NTSB NYC97LA101Accident · Serious injuriesLimited investigationFinal reportHiller UH-12E · Granby, NYfailure of the pilot/owner to replace the torsional clutch as specified by the manufacturer, and subsequent failure of the helicopter's clutch, which resulted in a forced landing (autorotation). A related factor was: the encounter with trees in the emergency…NTSB FTW96LA385Accident · Minor injuriesLimited investigationFinal reportHiller UH12E · Hamburg, ARThe loss of tail rotor control as result of a tail rotor blade strike by a partially disconnected ballast weight, due to a disconnected pin. A factor was the lack of suitable terrain for the forced landing.NTSB LAX96LA279Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Healdsburg, CAThe failure of the pilot to confirm a loss of power before entering autorotation after reading an erroneous instrument indication on the helicopter's dual tachometer. Factors in the accident were the erratic instrument, and maintenance personnel who failed to…NTSB ATL96LA104Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Cottondale, FLfailure of the main rotor drive torsional coupling and inner gimbal ring, which resulted in jamming of the flight controls during an attempted autorotation.NTSB LAX95LA318Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Dos Palos, CAthe fatigue failure of the tail rotor tension torsion bar plates.NTSB LAX95LA109Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Arvin, CAThe seizure of the transmission due to lack of lubrication from a plugged oil supply line.NTSB LAX95LA096Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Chowchilla, CAthe in-flight failure and separation of the main rotor hub due to a fatigue crack.NTSB SEA94LA149Accident · Minor injuriesLimited investigationFinal reportHiller-Soloy UH-12L4 · Clarkston, WADisconnection of the ballast bar aft retaining pin. Factor(s) were: tail rotor blade separation and reduced aircraft control.NTSB LAX94LA054Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Salinas, CAa fatigue failure of the torsion-tension bar pin due to fretting corrosion. A factor in this accident was an inadequate quality of material utilized in the manufacture of the pin.NTSB LAX94LA043Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Salinas, CAThe pilot's improper handling of the helicopter which resulted in overloading of the rotor system in a maneuvering turn during aerial application of chemical, and subsequent failure of the main rotor paddle assembly.NTSB LAX92LA349Accident · Minor injuriesLimited investigationFinal reportHiller UH12-E, Saloy Conver · Arvin, CAThe failure of the tension torsion bar pin due to fatigue. Contributing to this accident was that it was not possible for the pilot to flare the helicopter on landing.NTSB LAX92LA146Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Huron, CAA separation of the control rotor cuff due to fatigue.NTSB LAX91LA191Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Delano, CAThat the pilot improperly performed the autorotation by misjudging the flare altitude. Contributing to this accident was the total failure of the freewheeling sprag clutch due to excessive wear and the soft dirt terrain.NTSB CHI90DTG02Accident · No injuriesFinal reportHiller UH-12-E · Garrison, NDThe failure of the helicopter tail rotor control cable. A factor related to the accident was the chafing of the tail rotor control cable.NTSB CHI89DEM09Accident · Minor injuriesFinal reportHiller UH-12E · Hudsonville, MIThe fatigue failure of one of the tension-torsion pins.NTSB CHI89DEP04Accident · No injuriesFinal reportHiller UH-12E · Waterford, WIThe pilot's inability to maintain control during an autorotational landing attempt following the failure of the main rotor drive train torsional coupling.NTSB LAX89DVM02Accident · Minor injuriesFinal reportHiller UH-12E · Salinas, CAThe separation of the torsion coupling in the main rotor drive system.NTSB CHI88DER06Accident · No injuriesFinal reportHiller UH-12E · Buffalo Lake, MNWhen the helicopter lifted off, the left tail rotor cable separated. Directional control was lost and the aircraft collided with the terrain. The pilot reported no injuries, however the helicopter sustained substantial damage. An inspection of the left tail…NTSB LAX87DUJ11Accident · Minor injuriesFinal reportHiller UH-12E · Scottsdale, AZDuring an aerial application flight, the plt made a turn-around & was starting to make another swath run when he heard a loud 'bang' & then the helicopter collided with terrain. An inspn of the main rotor head & pin revealed the hub had failed from hi cycle…NTSB LAX86FVA14Accident · Minor injuriesFinal reportHiller UH-12E · Lemoore, CAThe plt reptd that while returning to the loading area after spraying a field, he heard a loud pop emanating from the engine compartment. Shortly thereafter he observed a fire in the engine compartment and lost forward and aft control of the helicopter. The…NTSB LAX86DVA09Accident · No injuriesFinal reportHiller UH-12E · Delano, CAThe helicopter rotor blade delaminated shortly after departing the operator's north base at Delano, CA. The investigation determined the blade contained extensive voids on the bond line. The blade was rejected by the manufacturer as being unairworthy. The…NTSB LAX86FVM05Accident · Minor injuriesFinal reportHiller UH12E · Castroville, CAThe acft landed hard and rolled over after the lndg skid failed in a forced lndg. The plt said he was crusing at 500 ft AGL over an open field when he heard a loud bang. The helicopter began to vibrate severely and spiral to the right. The plt lost ground…NTSB SEA86FA039Accident · 1 fatalField investigationFinal reportHiller-Soloy UH-12E · Horton, ORThe fork connecting the rotorcraft's blue blade to the main rotor hub separated after a long term fatigue crack had spread through more than 60% of the fork circumference. The operator failed to carry out the appropriate inspection of the fork unit as…NTSB DEN86LA016Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Vernal, UTThe plt stated he had just departed a site located on top of a mountain, which is approximately 12,200 ft MSL. The pilot said 30 seconds later, the helicopter lost partial power. Requiring him to make a force landing. The inspection of the turbocharger…NTSB LAX84LA494Accident · Serious injuriesLimited investigationFinal reportHiller UH12ET · Yuma, AZThe pilot stated that he was carrying a load of pesticide for application on a broccoli field. The aircraft was in level flight, approximately 4 to 8 feet AGL when it became uncontrollable and impacted the ground. The aircraft was consumed by a post crash…NTSB SEA84LA174Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Redmond, ORThe acft collided with the ground after a in-flt main rotor blade separation during an aerial application flt. Inspection of the fracture surface of the failed blade revealed characteristics consistant with the high stress, low cycle fatigue. Lab findings…NTSB ATL83LA355Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Cameron, SCThe plt stated that he was on a trimming/swath run at about 15 ft AGL & 15 mph when he heard a strange noise which was followed by a 180 deg yaw. Subsequently, the helicopter crash landed, damaging the tail boom & tail rotor blades and spreading the landing…NTSB MKC83LA207Accident · Minor injuriesLimited investigationFinal reportHiller UH-12E · Corwith, IAWhile en route, the plt heard a clanking noise behind him which was followed by a severe vibration of the flt controls. He initiated an autorotative descent from 3000 ft. he said the helicopter began to roll left, then righted itself. The helicopter touched…NTSB CHI83LA297Accident · No injuriesLimited investigationFinal reportHiller UH-12E · Brooten, MNThe helicopter had just lifted off of the flatbed of a truck when it started to spin. The plt lowered the collective, reduced the power & landed beside the truck. During touchdown, the main rotor blades struck the truck. An investigation revealed that the…